Santes, Victor; Gomez, Elizabeth; Zarate, Veronica; Santillan, Rosa; Farfan, Norberto; Rojas-Lima, Susana Tetrahedron Asymmetry, 2001, vol. 12, # 2 p. 241 - 247 doi: 10.1016/S0957-4166(01)00036-2