Ayyangar, Nagaraj R.; Kalkote, Uttam R.; Nikrad, Pandurang V.
Tetrahedron Letters, 1982 , vol. 23, # 10 p. 1099 - 1102

Ayyangar, N. R.; Kalkote, U. R.; Nikrad, P. V.
Indian Journal of Chemistry, Section B: Organic Chemistry Including Medicinal Chemistry, 1983 , vol. 22, # 9 p. 872 - 877