Citation: K\"oferstein, Roberto; Robl, Christian (2007). [(C6H10)(NH3)2][Ni(H2O)4C6H2(COO)4]·4H2O -- A Coordination Polymer with the Chain-like Polyanion {Ni(H2O)4[C6H2(COO)4]2−}n. Zeitschrift f\"ur anorganische und allgemeine Chemie, 633, pp. 1323-.