Shishoo, C. J.; Devani, M. B.; Karvekar, M. D.; Ullas, G. V.; Ananthan, S.; et al.
Indian Journal of Chemistry, Section B: Organic Chemistry Including Medicinal Chemistry, 1982 , vol. <B> 21, # 7 p. 666 - 668

Ried,W.; Giesse,R.
Justus Liebigs Annalen der Chemie, 1968 , vol. 713, p. 143 - 148

Shishoo, C. J.; Devani, M. B.; Karvekar, M. D.; Ullas, G. V.; Ananthan, S.; et al.
Indian Journal of Chemistry, Section B: Organic Chemistry Including Medicinal Chemistry, 1982 , vol. <B> 21, # 7 p. 666 - 668