@misc{Jasiński_Kazimierz_(1920–1997)_Nowy_1979,
 author={Jasiński, Kazimierz (1920–1997)},
 editor={Institute of History of the Polish Academy of Sciences},
 copyright={Creative Commons Attribution BY-ND 4.0 license},
 address={Warszawa ; Poznań},
 journal={Studia Źródłoznawcze},
 howpublished={online},
 year={1979},
 publisher={Państwowe Wydawnictwo Naukowe},
 language={pol},
 title={Nowy przyczynek do genealogii Piastów},
 type={Text},
 URL={http://rcin.org.pl/Content/29786/PDF/WA303_45249_B88-SZ-R-24-1979_Jasinski.pdf},
 keywords={Piast (dynasty) - genealogy, Helen of Znojmo, duchess of Polish (post 1140-ante 1206), Poland - 960-1370 (Piast period)},
}