Thi Bay, N., and Q. Ngoc Tho. “MATHEMATICAL MODEL OF SPREADING POLLUTANTS IN RIVER NETWORK PART 2: APPLICATION FOR SIMULATION OF DISPERSION IN THI VAI RIVER NETWORK”. Science and Technology Development Journal, Vol. 8, no. 6, June 2005, pp. 86-91, doi:https://doi.org/10.32508/stdj.v8i6.3016.