Baker; Leeds
Journal of the Chemical Society, 1948 , p. 974,979

Denissenko; Naber
Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, 1945 , p. 35,38
Chem. Zentralbl., 1946 2801
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Robinson; Walker
Journal of the Chemical Society, 1935 , p. 1530,1532
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Cornubert; Borrel
Bulletin de la Societe Chimique de France, 1930 , vol. <4> 47, p. 301,312
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Daltroff
Annales de Chimie (Cachan, France), 1940 , vol. <11> 14, p. 207,257
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Vavon; Horeau
Bulletin de la Societe Chimique de France, 1934 , vol. <5> 1, p. 1703,1709

Hueckel; Kindler
Chemische Berichte, 1947 , vol. 80, p. 202,204, 205

Robinson; Walker
Journal of the Chemical Society, 1935 , p. 1530,1532