@misc{Żurowski_W._Superfoetation_1975,
 author={Żurowski, W. and Doboszyńska, T.},
 volume={20},
 number={7},
 copyright={Rights Reserved - Free Access},
 journal={Acta Theriologica},
 address={Białowieża},
 howpublished={online},
 year={1975},
 language={eng ; Sum. ang ; pol.},
 title={Superfoetation in European beaver},
 type={Text},
 URL={http://www.rcin.org.pl/Content/10286/PDF/BI002_2613_Cz-40-2_Acta-T20-nr7-97-104_o.pdf},
 keywords={Castor fiber, oestrus, reproductive tract, superfetation, superfoetation, Bóbr europejski, superfetacja},
}