VALCHEVA N, IGNATOV I. MICROBIOLOGICAL EFFECTS OF COMBINATIONS OF COLLOIDAL SILVER (Ag), COPPER (Cu), SILICON (Si) AND ZINC (Zn) NANOPARTICLES FOR WASTE WATER. UPJOZ [Internet]. 2022 Jun. 13 [cited 2025 Jul. 5];43(11):45-50. Available from: https://mbimph.com/index.php/UPJOZ/article/view/3049