Sulaiman, Muhammad, 		Sulaman, Muhammad, 		Hamdi, Abdelwahed, AND 		Hussain, Zubair Hussain.
" The Plant Propagation Algorithm for the Optimal Operation of Directional Over-Current Relays in Electrical Engineering" <em>Mehran University Research Journal of Engineering and Technology</em> [Online], Volume 39 Number 2 (1 April 2020)