@misc{Paszkiewicz_Adam_Any_1980,
 author={Paszkiewicz, Adam},
 volume={28},
 editor={Polska Akademia Nauk.},
 editor={Państwowe Wydawnictwo Naukowe (1951–1992)},
 number={7-8},
 copyright={Rights Reserved - Restricted Access},
 address={Varsovie},
 howpublished={online},
 year={1980},
 publisher={Państwowe Wydawnictwo Naukowe},
 language={eng},
 title={Any self-adjoint operator is a finite linear combination of projectors},
 type={Text},
}