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Betlejewska K. , Kalisińska E. , Kornyushin V. , Salamatin R. 2002. EUCOLEUS CONTORTUS (CREPLIN, 1839) NEMATODE IN MALLARD (ANAS PLATYRHYNCHOS LINNAEUS, 1758) FROM NORTH-WESTERN POLAND, EJPAU 5(1), #03.