Thi Bay, N. and Ngoc Tho, N. 2005. MATHEMATICAL MODEL OF SPREADING POLLUTANTS IN RIVER NETWORK. PART 1: MATHEMATICAL MODEL. Science and Technology Development Journal. 8, 6 (Jun. 2005), 78-85. DOI:https://doi.org/https://doi.org/10.32508/stdj.v8i6.3013.