v. Braun; Weissbach
Chemische Berichte, 1931 , vol. 64, p. 1785,1788
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Manske
Journal of the American Chemical Society, 1931 , vol. 53, p. 1104,1108
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Hey; Kohn
Journal of the Chemical Society, 1949 , p. 3177,3179

Jackson; Kenner
Journal of the Chemical Society, 1928 , p. 578

Nelles
Chemische Berichte, 1932 , vol. 65, p. 1345