TY JOUR TI THE ISSUE OF GRAY RATS’ HELMINTHS OF OMSK CITY KW rats KW helminth KW extensiveness and intensity of infestation KW the species composition. JO Vestnik of Kazan State Agrarian University AU Penkina, O.U. AU Ushakova, E.L. AU Ivanyushina, A.M. AU Chebotareva, T.Y. PY 2017 IS 11 PB Kazan state agrarian University