Voigt,R.
Diss. <Frankfurt/M. 1939> S. 88

Kaishio; Gardner
Biochemical Journal, 1930 , vol. 24, p. 1047
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Montignie
Bulletin de la Societe Chimique de France, 1929 , vol. <4> 45, p. 771

Ramesh, Varadaraj; Weiss, Richard G.
Molecular Crystals and Liquid Crystals (1969-1991), 1986 , vol. 135, p. 13 - 22