Backer; de Jonge
Recueil des Travaux Chimiques des Pays-Bas, 1941 , vol. 60, p. 495,500
Recueil des Travaux Chimiques des Pays-Bas, 1943 , vol. 62, p. 158,160 Anm. 6
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Wasilew
Zhurnal Obshchei Khimii, 1946 , vol. 16, p. 451,452
Chem.Abstr., 1947 , p. 951

Mangini
Bollettino Scientifico della Facolta di Chimica Industriale di Bologna, 1940 , vol. 1, p. 143
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Krihnan; Iyer; Guha
Journal of the Indian Chemical Society, 1947 , vol. 24, p. 433,434
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Wasilew
Zhurnal Obshchei Khimii, 1946 , vol. 16, p. 451,452
Chem.Abstr., 1947 , p. 951