O. Ibopishak Singh, A. Bimola Devi, R. Hemakumar Singh, and R. Kadam, “Synthesis and Spectroscopic Studies of Dichloromono-(1-n-butylamidino-Omethylurea) copper(II), Dichloromono(1-i-butylamidino-O-methylurea)copper(II) and Dichloromono-(1-i-butylamidino-O-ethylurea)copper(II) Complexes”, ajc, vol. 20, no. 6, pp. 4397–4404, Mar. 2010.