@misc{Kowalczyk_Jan_(1833–1911)_Materialy_1906,
 author={Kowalczyk, Jan (1833–1911)},
 copyright={Domena Publiczna},
 address={Varšava},
 howpublished={online},
 year={1906},
 publisher={(Tipografiâ Varšavskago Učebnago Okruga)},
 language={rus},
 language={rus},
 type={Tekst},
 title={Materialy k'' istorii Observatorii Imperatorskago Varšsavskago Universiteta 1820-1900},
 URL={http://rcin.org.pl/Content/72114/PDF/WA248_92412_F-23-055_materialy_o.pdf},
 keywords={Uniwersytet Warszawski - historia},
}