Citation: Wang, Ruimin; Lehmann, Christian W.; Englert, Ulli (2009). Weak interactions in chain polymers [M(\m-X)~2~L~2~]~{\\infty ~} (M = Zn, Cd; X = Cl, Br; L = substituted pyridine) -- an electron density study. Acta Crystallographica Section B, 65, pp. 600-611.