Borsche; Doeller
Justus Liebigs Annalen der Chemie, 1939 , vol. 537, p. 53,65
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Stock et al.
Journal of Organic Chemistry, 1958 , vol. 23, p. 1840,1841
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Leonard; Boyer
Journal of the American Chemical Society, 1950 , vol. 72, p. 2980,2984