Giacometti, Andrea; Lucchi, Ottorino De; Dilillo, Francisco; Cossu, Sergio; Peters, Karl; et al.
Tetrahedron, 1994 , vol. 50, # 26 p. 7913 - 7922

Aromdee, Chantana; Cole, Edward R.; Crank, George
Australian Journal of Chemistry, 1983 , vol. 36, # 12 p. 2499 - 2509