参考文献
Aspelund; Eklund
Acta Academiae Aboensis, Series B: Mathematica et Physica, 1957 , vol. 21, # 3 p. 7
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Gad
Naunyn-Schmiedebergs Archiv fuer Experimentelle Pathologie und Pharmakologie, 1942 , vol. 199, p. 453
Chem.Abstr., 1943 , p. 6088