Sutter; Wijkman
Justus Liebigs Annalen der Chemie, 1933 , vol. 505, p. 248,249
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Ingold; Pritchard; Smith
Journal of the Chemical Society, 1934 , p. 86
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Stevens; Nagarajan; Haskell
Journal of Organic Chemistry, 1962 , vol. 27, p. 2991,3005