Safonyk A, Prysiazhniuk I, Prysiazhniuk O, Naumchuk O. MATHEMATICAL MODELING SINGULARLY PERTURBED PROCESSES OF WATER SOFTENING ON SODIUM-CATIONITE FILTERS. IAPGOS [Internet]. 2019 Mar. 3 [cited 2024 Apr. 27];9(1):37-40. Available from: https://ph.pollub.pl/index.php/iapgos/article/view/779