P. Siva Prasad , G. Srinivasa Rao, D. Madhusudhana Rao, K. Revathi. “Semi Space Homomorphism in Semi Groups”. International Journal of Advanced Science and Technology, Vol. 29, no. 06, May 2020, pp. 5262 -65, http://sersc.org/journals/index.php/IJAST/article/view/19586.