Fox, Daniel L.; Ruxer, John T.; Oliver, John M.; Alford, Kasey L.; Salvatore, Ralph Nicholas
Tetrahedron Letters, 2004 , vol. 45, # 2 p. 401 - 405

Monaci, Anna; Tarli, Franco
Journal of the Chemical Society, Dalton Transactions: Inorganic Chemistry (1972-1999), 1980 , p. 499 - 502