Some metazoan parasites of ring-necked ducks, aythya collaris (Donovan), from Canada.

@article{Noseworthy1978SomeMP,
  title={Some metazoan parasites of ring-necked ducks, aythya collaris (Donovan), from Canada.},
  author={S M Noseworthy and W T Threlfall},
  journal={The Journal of parasitology},
  year={1978},
  volume={64 2},
  pages={365-7}
}