Soner, N. D., Chaluvaraju, B. and Janakiram, B. (2003) “The Double Global Domination Number of a Graph”, The Journal of the Indian Mathematical Society, 70(1-4), pp. 191–195. Available at: http://informaticsjournals.com/index.php/jims/article/view/21949 (Accessed: 2 October 2024).