Cong Tam, N., and N. Hoi Nghia. “ON THE REGULARIZATION OF AN INVERSE PROBLEM CONCERNED TO PROBLEM OF CHEMICAL PENETRATION”. VNUHCM Journal of Science and Technology Development, Vol. 4, no. 8&9, Sept. 2001, pp. 72-79, doi:https://doi.org/10.32508/stdj.v4i8&9.3517.