@ARTICLE{Czykier_E._Is_2011, author={Czykier, E.}, number={No 2}, journal={Polish Journal of Veterinary Sciences}, howpublished={online}, year={2011}, publisher={Polish Academy of Sciences Committee of Veterinary Sciences}, publisher={University of Warmia and Mazury in Olsztyn}, title={Is spermiogenesis common or rare in young male European bison aged 2 and 3 years?}, URL={http://journals.pan.pl/Content/98929/PDF/10_paper.pdf}, doi={10.2478/v10181-011-0036-5}, }