@misc{_Bulletin_2000,
 volume={48},
 number={2},
 editor={Polska Akademia Nauk.},
 copyright={Rights Reserved - Restricted Access},
 address={Warsaw},
 address={Warsaw},
 howpublished={online},
 year={2000},
 publisher={Polska Akademia Nauk. Centrum Upowszechniania Nauki.},
 language={eng},
 title={Bulletin of the Polish Academy of Sciences. Mathematics T.48 z.2 (2000)},
 type={Text},
}