Complexes of dimethyldihalotin (iv) with imidazole and pyrazole: the crystal structure of dibromobis ( pyrazole ) dimethyl (iv) - Alberte, B; Sanchez Gonzalez, A; Garcia, E; Casas, J S; Sordo, J; Castellano, Eduardo Ernesto (Journal of Organometallic Chemistry, 1988)