Levaillant
Comptes Rendus Hebdomadaires des Seances de l'Academie des Sciences, 1932 , vol. 195, p. 883
Annales de Chimie (Cachan, France), 1936 , vol. <11>6, p. 550,551,553
Airan; Shah
Journal of the University of Bombay, Science: Physical Sciences, Mathematics, Biological Sciences and Medicine, 1942 , vol. 10/5 A, p. 131,134