Ni, R. ., M. I. . Mohamadin, and V. Y. M. . Jong. “Synthesis, Spectral Characterisation and Antimicrobial Properties of Cu(II) and Fe(II) Complexes With Xanthone”. Scientific Research Journal, vol. 14, no. 1, June 2017, pp. 1-14, doi:10.24191/srj.v14i1.9368.