@misc{_Bulletin_1979,
 editor={Polska Akademia Nauk.},
 editor={Państwowe Wydawnictwo Naukowe (1951–1992)},
 copyright={Rights Reserved - Restricted Access},
 address={Varsovie},
 howpublished={online},
 year={1979},
 publisher={Państwowe Wydawnictwo Naukowe},
 language={eng, ger, fre, rus},
 title={Bulletin de lʾAcademie Polonaise des Sciences. Série des Sciences Mathématiques T. 27 (1979)},
 title={Bulletin of the Polish Academy of Sciences},
 type={Text},
}