Rao, C. Someswara; Rambabu, M.; Srinivasan, P. S.
Indian Journal of Chemistry, Section B: Organic Chemistry Including Medicinal Chemistry, 1987 , vol. 26, # 1-12 p. 407 - 411
Pashinnik, V. E.; Tovstenko, V. I.; Bobkova, L. S.; Markovskii, L. N.
Journal of Organic Chemistry USSR (English Translation), 1985 , vol. 21, p. 1897 - 1900
Zhurnal Organicheskoi Khimii, 1985 , vol. 21, # 10 p. 2072 - 2076