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Zhurnal Organicheskoi Khimii, 1988 , vol. 24, # 7 p. 1550 - 1555

Kreutzer, Peter H.; Weis, Johann Ch.; Bock, Henning; Erbe, Juergen; Beck, Wolfgang
Chemische Berichte, 1983 , vol. 116, # 7 p. 2691 - 2707

Osipova, T. F.; Koldobskii, G. I.; Ostrovskii, V. A.
Journal of Organic Chemistry USSR (English Translation), 1984 , vol. 20, p. 2248 - 2252
Zhurnal Organicheskoi Khimii, 1984 , vol. 20, # 11 p. 2468 - 2473