Hydrogen-bonded supramolecule of N, N′-bis(4-pyridylmethyl)oxalamide and a zigzag chain structure of catena-poly[[[dichloridocobalt(II)]-μ- N, N′-bis(4-pyridylmethyl)oxalamide-κ2 N4: N4′] hemihydrate] - Gene-Hsiang Lee; Hsin-Ta Wang (Acta Crystallographica: Section C (Wiley-Blackwell), 2007)