Hauser; Jordan
Journal of the American Chemical Society, 1935 , vol. 57, p. 2451
Journal of the American Chemical Society, 1936 , vol. 58, p. 1773

Hantzsch
Chemische Berichte, 1891 , vol. 24, p. 41

Hauser; Jordan
Journal of the American Chemical Society, 1935 , vol. 57, p. 2451
Journal of the American Chemical Society, 1936 , vol. 58, p. 1773
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Vermillion; Hauser
Journal of Organic Chemistry, 1941 , vol. 6, p. 507,508,513,514

Hantzsch
Chemische Berichte, 1891 , vol. 24, p. 41

Hantzsch
Zeitschrift fuer Physikalische Chemie, Stoechiometrie und Verwandtschaftslehre, 1894 , vol. 13, p. 511,523