$a Treatise on invertebrate paleontology. Pt. P, Arthropoda 2 : Chelicerata with sections on Pycnogonida and Palaeoisopus / Leif Størmer, Alexander Petrunkevitch, and Joel W. Hedgpeth ; dir. and ed. by Raymond C. Moore. - New York ; Lawrence, 1955.
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$a ABES online
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$a LCA online
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$a en.wikipedia, 29.11.11 $b (Leif Størmer (1 July 1905 – 15 May 1979) was a Norwegian paleontologist and geologist)