Meyer,H.
Chemische Berichte, 1909 , vol. 42, p. 144
Monatshefte fuer Chemie, 1909 , vol. 30, p. 174

Loskutov
Russian Journal of Organic Chemistry, 2000 , vol. 36, # 4 p. 528 - 530

Meyer,H.
Chemische Berichte, 1909 , vol. 42, p. 144
Monatshefte fuer Chemie, 1909 , vol. 30, p. 174

Bergmann; Schuchardt
Justus Liebigs Annalen der Chemie, 1931 , vol. 487, p. 225,262
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Matthews
Journal of the Chemical Society, 1926 , p. 243
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Clar
Chemische Berichte, 1932 , vol. 65, p. 518

Matthews
Journal of the Chemical Society, 1926 , p. 243

Barnett; Matthews Journal of the Chemical Society, 1923 ,  vol. 123, p. 390