Ampadu, Clement Boateng. “G-Complete G-Metric-Like Spaces, G-O-Completeness, and Some Common Fixed Point Theorems”. Journal of Global Research in Mathematical Archives(JGRMA), vol. 1, no. 9, Jan. 2014, pp. 1-8, https://jgrma.com/index.php/jgrma/article/view/98.