Hjelt
Jahresbericht ueber die Fortschritte der Chemie und Verwandter Theile Anderer Wissenschaften, 1887 , p. 1536
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Hjelt
Oef. Fi., vol. 29, p. 163
Underwood; Baril
Journal of the American Chemical Society, 1930 , vol. 52, p. 395,396
Journal of the American Chemical Society, 1931 , vol. 53, p. 2200,2202