Kostov, Iliyan. “REVIEW ON SOME RISKS TO HUMAN HEALTH RELATING TO THE CONSUMPTION OF MUSSELS OBTAINED IN THE WATERS BEFORE THE BULGARIAN BLACK SEA COAST”. KNOWLEDGE - International Journal , vol. 41, no. 3, Aug. 2020, pp. 681-6, https://ikm.mk/ojs/index.php/kij/article/view/754.