Ouatiki, K., L. Bahi, M. O. Awa, L. Ouadif, A. Akhssas, and E. H. Ejjaaouani. “Identification Of Collapsible Soils In Deroua (Morocco)”. European Scientific Journal, ESJ, Vol. 12, no. 6, Feb. 2016, p. 255, doi:10.19044/esj.2016.v12n6p255.