Pettit, George R.; Gieschen, Donald P.; Pettit, William E.; Rawson, Thomas E.
Canadian Journal of Chemistry, 1981 , vol. 59, p. 217 - 221

Akhbari, Kamran; Morsali, Ali; Retailleau, Pascal
Polyhedron, 2010 , vol. 29, # 18 p. 3304 - 3309