Research areas

  1. Published

    Oversigt over Botanisk Haves Plantesamling

    Friis, Ib & Edlefsen, L. B., 1970, Københavns Universitets Fond til tilvejebringelse af læremidler. 101 p.

    Research output: Book/ReportBook

  2. Published

    A new species of Guizotia (Compositae) from NE tropical Africa

    Friis, Ib, 1971, In: Norwegian Journal of Botany. 18, p. 231-234

    Research output: Contribution to journalJournal articlepeer-review

  3. Published

    A new species of Haemanthus (Amaryllidaceae) from SW Ethiopia

    Friis, Ib & Bjørnstad, I., 1971, In: Norwegian Journal of Botany. 18, p. 227-230

    Research output: Contribution to journalJournal articlepeer-review

  4. Published

    A revision of the Stachys aculeolatus group (Labiateae) in tropical Africa

    Friis, Ib, Bjørnstad, I. & Thulin, M., 1971, In: Norwegian Journal of Botany. 18, p. 121-138

    Research output: Contribution to journalJournal articlepeer-review

  5. Published

    Hall effect in the normal and flux-flow states of some indium alloys

    Byrnak, B. & Rasmussen, Finn Berg, 1 Oct 1971, In: Physica B: Condensed Matter. 55, p. 357-361 5 p.

    Research output: Contribution to journalJournal articlepeer-review

  6. Published

    Non-commutative integration for monotone sequentially closed C∗ algebras

    Christensen, Erik, 1972, In: Mathematica Scandinavica. 31, p. 171-190 20 p.

    Research output: Contribution to journalJournal articlepeer-review

  7. Published

    Studies in the genus Haemanthus (Amaryllidaceae) I. The infrageneric taxonomy

    Friis, Ib & Bjørnstad, I., 1972, In: Norwegian Journal of Botany. 19, p. 187-206

    Research output: Contribution to journalJournal articlepeer-review

  8. Published

    Studies in the genus Haemanthus (Amaryllidaceae) II. A revision of the section Demeusea (De Wild. & Th. Dur.) Pax & Hoffm. emend Bjørnst. & Friis

    Friis, Ib & Bjørnstad, I., 1972, In: Norwegian Journal of Botany. 19, p. 207 — 222.

    Research output: Contribution to journalJournal articlepeer-review

  9. Published

    Dorstenia soerensenii sp. nov. (Moraceae) from SW Ethiopia, and related species

    Friis, Ib, 1974, In: Norwegian Journal of Botany. 21, p. 101-110

    Research output: Contribution to journalJournal articlepeer-review

  10. Published

    Studies in the genus Haemanthus (Amaryllidaceae) III. A revision of the sections Gyaxis and Nerissa

    Friis, Ib & Bjørnstad, I., 1974, In: Norwegian Journal of Botany. 21, p. 243-275

    Research output: Contribution to journalJournal articlepeer-review

  11. Published

    Observation of nuclear magnetic order in solid 3He

    Halperin, W. P., Archie, C. N., Rasmussen, Finn Berg, Buhrman, R. A. & Richardson, R. C., 1 Jan 1974, In: Physical Review Letters. 32, 17, p. 927-930 4 p.

    Research output: Contribution to journalJournal articlepeer-review

  12. Published

    Linociera giordanoi (Oleaceae) - the correct name for a widespread African species

    Friis, Ib, 1975, In: Kew Bulletin. 30, p. 16-16

    Research output: Contribution to journalJournal articlepeer-review

  13. Published

    The giant species of Cirsium (Asteraceae) in S Ethiopia

    Friis, Ib, 1975, In: Norwegian Journal of Botany. 22, p. 201 - 207

    Research output: Contribution to journalJournal articlepeer-review

  14. Published

    The two alternative systems of nomenclature proposed and used for orchids by Du Petit-Thouars

    Friis, Ib & Rasmussen, Finn N., 1975, In: Taxon. 24, p. 307-318

    Research output: Contribution to journalJournal articlepeer-review

  15. Published

    Thermodynamic temperature scale derived from measurements of 3He latent heat

    Rasmussen, Finn Berg, Halperin, W. P., Archie, C. N. & Richardson, R. C., 24 Mar 1975, In: Physical Review Letters. 34, 12, p. 718-721 4 p.

    Research output: Contribution to journalJournal articlepeer-review

  16. Published

    Pelargonium boranense sp. nov. (Geraniaceae)

    Friis, Ib & Gilbert, M. G., 1976, In: Flowering Plants of Africa. 43, p. Tab. 1705 + 4 pp. text

    Research output: Contribution to journalJournal articlepeer-review

  17. Published

    Omkring en berømt dansk botaniker i Indien [Nathanael Wallich]

    Friis, Ib & Hamann, O. J., 1976, In: Naturens Verden. 1976, 12, p. 393-408

    Research output: Contribution to journalJournal article

  18. Published

    Progress made in the botanical exploration of Africa: Ethiopia

    Friis, Ib, 1976, In: Boissiera. 24, p. 599-599

    Research output: Contribution to journalJournal article

  19. Published

    Studies in the genus Haemanthus (Amaryllidaceae) IV. Division of the genus into Haemanthus s. str. and Scadoxus, with notes on Haemanthus s. str

    Friis, Ib & Nordal, I., 1976, In: Norwegian Journal of Botany. 23, p. 63-77

    Research output: Contribution to journalJournal articlepeer-review

  20. Published

    Specific heat of normal and superfluid 3He on the melting curve

    Halperin, W. P., Archie, C. N., Rasmussen, Finn Berg, Alvesalo, T. & Richardson, R. C., 1 Mar 1976, In: Physical Review B. Condensed Matter and Materials Physics. 13, p. 2124-2131 8 p.

    Research output: Contribution to journalJournal articlepeer-review

  21. Published

    Perturbations of operator algebras II.

    Christensen, Erik, 1977, In: Indiana University Mathematics Journal. 26, p. 891 - 904 14 p.

    Research output: Contribution to journalJournal articlepeer-review

  22. Published

    A reconsideration of the genera Monotheca and Spiniluma (Sapotaceae)

    Friis, Ib, 1978, In: Kew Bulletin. 33, p. 91-98

    Research output: Contribution to journalJournal articlepeer-review

  23. Published

    East African bryophytes IV. Danish collections

    Bizot, M., Friis, Ib, Lewinsky, J. & Thamas, P., 1978, In: Lindbergia. 4, p. 259-284

    Research output: Contribution to journalJournal articlepeer-review

  24. Published

    Properties of melting  3He: specific heat, entropy, latent heat and temperature

    Halperin, W. P., Rasmussen, Finn Berg, Archie, C. N. & Richardson, R. C., 1978, In: Journal of Low Temperature Physics. 31, p. 617

    Research output: Contribution to journalJournal articlepeer-review

  25. Published

    Dombeya torrida, the correct name for James Bruce's "Walkuffa"

    Friis, Ib & Hepper, F. N., 1979, In: Botaniska Notiser. 132, p. 397-398

    Research output: Contribution to journalJournal article

  26. Published

    Cohomology of operator algebras and quantum dynamical semigroups.

    Christensen, Erik & Evans , D. E., 1979, In: Journal of the London Mathematical Society. 20, 2, p. 358-368 11 p.

    Research output: Contribution to journalJournal articlepeer-review

  27. Published

    The wild populations of Coffea arabica L. and the cultivated coffee

    Friis, Ib, 1979, Taxonomic Aspects of African Economic Botany: Proceedings of the IXth Plenary Meeting of AETFAT.. Kunkel, G. (ed.). Las Palmas de Gran Canaria., p. 63-68

    Research output: Chapter in Book/Report/Conference proceedingBook chapterResearch

  28. Published

    Spin polarization of liquid 3He by rapid melting of polarized solid

    Chapellier, M., Frossati, G. & Rasmussen, Finn Berg, 20 May 1979, In: Physical Review Letters. 42, p. 904-907 4 p.

    Research output: Contribution to journalJournal articlepeer-review

  29. Published

    Proposal to conserve the generic name Hagenia J. F. Gmel. over Bankesia Bruce (Rosaceae)

    Friis, Ib, Hepper, F. N. & Jansen, P. C. M., 1980, In: Taxon. 29, p. 511-512

    Research output: Contribution to journalJournal articlepeer-review

  30. Published

    The authority and date of publication of the genus Casuarina (Casuarinaceae) and its type species

    Friis, Ib, 1980, In: Taxon. 29, p. 511-512

    Research output: Contribution to journalJournal articlepeer-review

  31. Published

    The identity of the Ethiopian monotypic genus Tzellemtinia Chiov

    Friis, Ib & Vollesen, K., 1980, In: Botaniska Notiser. 133, p. 347-349

    Research output: Contribution to journalJournal article

  32. Published

    Production of highly polarized solid 3He in a Pomeranchuk cell

    Rasmussen, Finn Berg, 1 Jul 1980, In: Journal de Physique. Colloques. 41, C7, p. C7: 89-94 6 p.

    Research output: Contribution to journalJournal articlepeer-review

  33. Published

    A note on effective publication

    Friis, Ib & Dahlgren, R., 1981, In: Taxon. 30, p. 499-501

    Research output: Contribution to journalJournal articlepeer-review

  34. Published

    A synopsis of the genus Girardinia Gaud. (Urticaceae)

    Friis, Ib, 1981, In: Kew Bulletin. 36, p. 143-157

    Research output: Contribution to journalJournal articlepeer-review

  35. Published

    Notes on Somalian Sapindaceae

    Friis, Ib, 1981, In: Kew Bulletin. 36, p. 139-141

    Research output: Contribution to journalJournal articlepeer-review

  36. Published

    On non-selfadjoint representations of C*-algebras

    Christensen, Erik, 1981, In: American Journal of Mathematics. 103, p. 817 - 833 17 p.

    Research output: Contribution to journalJournal articlepeer-review

  37. Published

    The taxonomy and distribution of Mimusops laurifolia (Sapotaceae)

    Friis, Ib, 1981, In: Kew Bulletin. 35, p. 785-792

    Research output: Contribution to journalJournal articlepeer-review

  38. Published

    Superconductivity in (TMTSF)2 ClO4 at zero pressure

    Bechgaard, K., Carneiro, K., Jacobsen, C. S., Olsen, Malte, Rasmussen, Finn Berg & Rindorf, G., 1 Feb 1981, In: J. Molecul. Crystals and Liquid Crystals. 79, p. 271-275 5 p.

    Research output: Contribution to journalJournal articlepeer-review

  39. Published

    Zero-pressure organic superconductor: Di- (Tetramethyltetraselenafulvalenium)-perchlorate [(TMTSF)2ClO4]

    Bechgaard, K., Carneiro, K., Olsen, Malte, Jacobsen, C. S. & Rasmussen, Finn Berg, 30 Mar 1981, In: Physical Review Letters. 46, 13, p. 852-855 4 p.

    Research output: Contribution to journalJournal articlepeer-review

  40. Published

    Fluctuation-induced first-order nuclear magnetic transition in solid 3He

    Bak, P. & Rasmussen, Finn Berg, 19 May 1981, In: Physical Review B. Condensed Matter and Materials Physics. 23, 9, p. 4538-4540 3 p.

    Research output: Contribution to journalJournal articlepeer-review

  41. Published

    Experiment on the melting pressure of spin polarized He3

    Chapellier, M., Olsen, Malte & Rasmussen, Finn Berg, 1 Aug 1981, In: Physica B: Condensed Matter. 107, 1-3, p. 31-32 2 p.

    Research output: Contribution to journalJournal article

  42. Published

    What causes the first-order magnetic transition in solid 3He

    Bak, P. & Rasmussen, Finn Berg, 1 Sep 1981, In: Physica B: Condensed Matter. 108, 1-3, p. 849-51 3 p.

    Research output: Contribution to journalJournal articlepeer-review

  43. Published

    Derivations and their relation to perturbations of operator algebras

    Christensen, Erik, 1982, American Mathematical Society Symposia . Vol. 38. p. 261 - 273 13 p.

    Research output: Chapter in Book/Report/Conference proceedingArticle in proceedingsResearchpeer-review

  44. Published

    Extensions of derivations II

    Christensen, Erik, 1982, In: Mathematica Scandinavica. 50, p. 111 -122 12 p.

    Research output: Contribution to journalJournal articlepeer-review

  45. Published

    Name changes for well known species of Boehmeria (Urticaceae)

    Friis, Ib & Marais, W., 1982, In: Kew Bulletin. 37, p. 163-163

    Research output: Contribution to journalJournal articlepeer-review

  46. Published

    New taxa from the Imatong Mountains, S. Sudan

    Friis, Ib & Vollesen, K., 1982, In: Kew Bulletin. 38, p. 221-228

    Research output: Contribution to journalJournal articlepeer-review

  47. Published

    Studies in the flora and vegetation of SW Ethiopia

    Friis, Ib, Rasmussen, Finn N. & Vollesen, K., 1982, In: Opera Botanica. 63, p. 1-70

    Research output: Contribution to journalJournal articlepeer-review

  48. Published

    The identity of Rumicicarpus ramosissimus Chiov. (Tiliaceae)

    Friis, Ib, 1982, In: Nordic Journal of Botany. 2, p. 111-113

    Research output: Contribution to journalJournal articlepeer-review

  49. Published

    The identity of Urera longifolia and U. oligoloba, a supplement to Chew's monograph of Laportea (Urticaceae)

    Friis, Ib, 1982, In: Nordic Journal of Botany. 2, p. 231-233

    Research output: Contribution to journalJournal articlepeer-review

  50. Published

    The typification of Forsskaolea viridis Ehrenb. ex Webb (Urticaceae)

    Friis, Ib, 1982, In: Taxon. 31, p. 727-729

    Research output: Contribution to journalJournal articlepeer-review

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