Pollard et al.
Journal of Organic Chemistry, 1959 , vol. 24, p. 764

Agarwal, Shiv K.; Kumar, Yatendra; Saxena, Anil K.; Jain, Padam C.; Anand, Nitya
Indian Journal of Chemistry, Section B: Organic Chemistry Including Medicinal Chemistry, 1982 , vol. 21, # 5 p. 435 - 439

Caliendo, Giuseppe; Fiorino, Ferdinando; Grieco, Paolo; Perissutti, Elisa; Santagada, Vincenzo; Severino, Beatrice; Bruni, Giancarlo; Romeo, Maria Rosaria
Bioorganic and Medicinal Chemistry, 2000 , vol. 8, # 3 p. 533 - 538