Kumar, Vinod; Kaushik
Tetrahedron Letters, 2006 , vol. 47, # 9 p. 1457 - 1460

Curran, Dennis P.; Zhang, Jiancun
Journal of the Chemical Society, Perkin Transactions 1: Organic and Bio-Organic Chemistry (1972-1999), 1991 , p. 2613 - 2625

Aversa,M.C. et al.
Gazzetta Chimica Italiana, 1966 , vol. 96, p. 1046 - 1057