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I. Bernal; J. Cetrullo; W. G. Jackson (1993). "The phenomenon of conglomerate crystallization in coordination compounds. XXIII: The crystallization behavior of [cis-Co(en)2(N3)(SO3)]·2H2O (I) and of [cis-Co(en)2(NO2)(SO3)]·H2O (II)". Struct. Chem. 4: 235. doi:10.1007/BF00673698. S2CID94847897.