Copper nanoparticles and their oxides: optical, anticancer and antibacterial properties Muniratu Maliki, Ikhazuagbe H. Ifijen*, Esther U. Ikhuoria, Eribe M. Jonathan, Gregory E. Onaiwu, Ukeme D. Archibong, Augustine Ighodaro, 10.1007/s40089-022-00380-2 XML