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Levaillant
Annales de Chimie (Cachan, France), 1936 , vol. <11>6, p. 524,525
Comptes Rendus Hebdomadaires des Seances de l'Academie des Sciences, 1930 , vol. 190, p. 56
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Bissinger; Kung
Journal of the American Chemical Society, 1947 , vol. 69, p. 2162 Anm.17
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Am.Cyanamid Co.
Patent: US2377148 , 1941 ;
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Komissarow
Zhurnal Obshchei Khimii, 1933 , vol. 3, p. 311,312
Chem. Zentralbl., 1934 , vol. 105, # II p. 40