Kadam, S. M.; Nayak, S. K.; Banerji, A.
Tetrahedron Letters, 1992 , vol. 33, # 35 p. 5129 - 5132

Rao, B. V. S. K.; Gangadhar, A.; Subbarao, R.; Lakshminarayana, G.
Organic Preparations and Procedures International, 1991 , vol. 23, # 1 p. 119 - 122

Pfizer Inc.
Patent: US4255426 A1, 1981 ;