TY JOUR TI CONTAMINATION OF WILD WATERFOWL IN OMSK REGION WITH HELMINTHES KW the fauna of helminthes KW wild water-fowl KW cestodes KW nematodes KW trematodes KW invasion extensiveness and intensity JO Bulletin of KSAU AU Penkina, O.L. AU Ushakova, E.L. AU Ivanyushina, A.M. AU Chebotareva, T.Y. PY 2017 IS PB Krasnoyarsk State Agrarian University