Schoeberl; Lange
Justus Liebigs Annalen der Chemie, 1956 , vol. 599, p. 140,152
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Challenger; Hollingworth
Journal of the Chemical Society, 1959 , p. 61,66
Karrer; Schmid
Helvetica Chimica Acta, 1944 , vol. 27, p. 124,126
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Schoeberl
Chemische Berichte, 1947 , vol. 80, p. 381,384
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Larsson; Joensson
Chemische Berichte, 1934 , vol. 67, p. 759