@ARTICLE{Janowski_T._Effectiveness_2012,
 author={Janowski, T. and Socha, P. and Rudowska, M.},
 number={No 3},
 howpublished={online},
 year={2012},
 publisher={Polish Academy of Sciences Committee of Veterinary Sciences},
 publisher={University of Warmia and Mazury in Olsztyn},
 title={Effectiveness of determining the parturition date in bitches using the ultrasonographic fetometry as compared to hormonal and cytological methods},
 URL={http://journals.pan.pl/Content/99063/PDF/6.pdf},
 doi={10.2478/v10181-012-0069-4},
}