Gupta, K. A.; Saxena, Anil K.; Jain, Padam C.; Dua, P. R.; Prasad, C. R.; Anand, Nitya
Indian Journal of Chemistry, Section B: Organic Chemistry Including Medicinal Chemistry, 1983 , vol. <B> 22, # 8 p. 789 - 794

Gupta, K. A.; Saxena, Anil K.; Jain, Padam C.; Dua, P. R.; Prasad, C. R.; Anand, Nitya
Indian Journal of Chemistry, Section B: Organic Chemistry Including Medicinal Chemistry, 1983 , vol. <B> 22, # 8 p. 789 - 794

Levchenko, E. S.; Borovikova, G. S.; Borovik, E. I.; Kalinin, V. N.
Journal of Organic Chemistry USSR (English Translation), 1984 , vol. 20, p. 176 - 181
Zhurnal Organicheskoi Khimii, 1984 , vol. 20, # 1 p. 196 - 201

Levchenko, E. S.; Borovikova, G. S.; Borovik, E. I.; Kalinin, V. N.
Journal of Organic Chemistry USSR (English Translation), 1984 , vol. 20, p. 176 - 181
Zhurnal Organicheskoi Khimii, 1984 , vol. 20, # 1 p. 196 - 201