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  1. Published

    Progress made in the botanical exploration of Africa: Ethiopia

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

    Research output: Contribution to journal › Journal article › Research

  2. 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 journal › Journal article › Research › peer-review

  3. 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 journal › Journal article › Research › peer-review

  4. 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 journal › Journal article › Research › peer-review

  5. 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 journal › Journal article › Research › peer-review

  6. 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 journal › Journal article › Research › peer-review

  7. 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 journal › Journal article › Research › peer-review

  8. 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 journal › Journal article › Research › peer-review

  9. 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 journal › Journal article › Research › peer-review

  10. 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 journal › Journal article › Research › peer-review

  11. 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 journal › Journal article › Research › peer-review

  12. 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 journal › Journal article › Research › peer-review

  13. 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 journal › Journal article › Research › peer-review

  14. 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 journal › Journal article › Research › peer-review

  15. 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 journal › Journal article › Research › peer-review

  16. 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 journal › Journal article › Research › peer-review

  17. Published

    Oversigt over Botanisk Haves Plantesamling

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

    Research output: Book/Report › Book › Education

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