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Christensen, Carl (1924-1926) Den danske botaniks historie med tilhørende
Bibliografi. København, H. Hagerups Forlag. Three vols. 680 s.
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176:. 744 s. Index Filicum Supplementum I-III (1913–17). Reprint 1973 by Koeltz Antiquariat.
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Benedict, R. C. (1912). "Carl
Frederik Albert Christensen: Some Biographical Notes".
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Pichi-Sermolli, R. (1946). "Carl
Christensen in memoriam (1872–1942)".
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