Hussein, M. S., Al-Hamdany, A. W. J. and Saeed, R. A. (2018) “Synthesis and Spectral Characterization of Some New Substituted Bis-spirocyclohexanones Derived from Acetone”, Science Journal of University of Zakho, 6(4), pp. 155–159. doi: 10.25271/sjuoz.2018.6.4.548.