Zam, Dawa, Sangay Jamtsho, Tshering Dema, Jhulen Chettri, and Chimi Wangmo. 2013. “Optimization of Solid Waste Collection and Transportation Route in Phuentsholing City Using GIS”. Zorig Melong | A Technical Journal of Science, Engineering and Technology 1 (1): 11-19. http://103.133.216.217/index.php/zm/article/view/42.