@misc{_Jan,
 copyright={Public Domain},
 howpublished={online},
 title={Jan Aleksander Bayger - portrait},
 type={Image},
 URL={http://rcin.org.pl/Content/76822/PDF/WA058_90694_Bayger_2.pdf},
 keywords={Bayger, Jan Aleksander (1867-1958), zoologists, herpetologists, teachers, promoters of science, textbooks authors, biologists - Poland - biography},
}