Buxtorf, R. et al. 1974. Complexes with macrocyclic ligands, III: Pentaco-ordinate metal complexes with 1,4,7,10,12,12 - hexamethyl -1,4,7,10- tetraazacyclotridecane, 1,4,8,11-tetramethyl-1,4,8,11-tetraazacyclotetradecane and 1,4,5,8,11,12- hexamethyl-1,4,8,11-tetraazacyclotetradecane. CHIMIA. 28, 1 (Jan. 1974), 15. DOI:https://doi.org/10.2533/chimia.1974.15_2.