@misc{Mączyński_Maciej_J._A_1981,
 author={Mączyński, Maciej J.},
 volume={29},
 editor={Państwowe Wydawnictwo Naukowe (1951–1992)},
 editor={Polska Akademia Nauk.},
 number={3-4},
 copyright={Rights Reserved - Restricted Access},
 address={Varsovie},
 howpublished={online},
 year={1981},
 publisher={Państwowe Wydawnictwo Naukowe},
 language={eng},
 type={Text},
 title={A numerical characterization of commuting projections in Hilbert space},
}