Kuhn; Loew
Chemische Berichte, 1944 , vol. 77/79, p. 211,213
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Nakamura; Fukuchi
Yakugaku Zasshi, 1940 , vol. 60, p. 449,457;engl.Ref.S. 179
Chem.Abstr., 1940 , p. 7910

Row; Seshadri
Proceedings - Indian Academy of Sciences, Section A, 1946 , vol. 23, p. 23,27,28