S. K. Agarwal and M. Lal, “Structural Investigations on Co(II), Ni(II) and Cu(II) Biligand Coordination Compounds with 7-Hydroxy-4-Phenyl-6-(α-Naphthyl)-Aminomethyl Coumarin as Primary and 4-Nitroso-1-Hydroxy-2-Naphthoic Acid As Secondary Ligand ”, ajc, vol. 10, no. 4, pp. 1051–1053, Mar. 2010.