“Preparation and Physico-Chemical Investigation Studies for the of Mn(II),Co(II),Ni(II) and Cu(II) Metal Complexes with Ligand 2- Hydroxybenzaldine Urea” (2016) Baghdad Science Journal, 13(2.2NCC), p. 0115. doi:10.21123/bsj.2016.13.2.2NCC.0115.