Suresh Babu; Karanth; Divakar
Indian Journal of Chemistry - Section B Organic and Medicinal Chemistry, 2002 , vol. 41, # 5 p. 1068 - 1071

Kawai et al.
Yakugaku Zasshi, 1956 , vol. 76, p. 660,664
Chem.Abstr., 1957 , p. 1067