ANALYSIS OF POLLUTANT CONCENTRATION IN SURFACE WATERS USING ONE - DIMENSIONAL ADVECTION DIFFUSION EQUATION WITH TEMPORALLY VARYING COEFFICIENTS. International Journal of Engineering Sciences & Research Technology, [S. l.], v. 12, n. 1, p. 1–12, 2023. Disponível em: http://www.ijesrt.com/index.php/J-ijesrt/article/view/1.. Acesso em: 30 apr. 2025.