Rai, B.K., and Arun Kumar. “Structural Aspects of Schiff Base Metal Complexes of Co(II), Ni(II) and Cu(II) Complexes Derived from 4-Hydroxy-1-Ethyl Quinoline”. Asian Journal of Chemistry, vol. 25, no. 2, Sept. 2012, pp. 1169-70, doi:10.14233/ajchem.2013.13199A.