@misc{Pol_Roman_A_1982,
 author={Pol, Roman},
 volume={30},
 editor={Polska Akademia Nauk.},
 editor={Państwowe Wydawnictwo Naukowe (1951–1992)},
 number={9-10},
 copyright={Rights Reserved - Restricted Access},
 address={Varsovie},
 howpublished={online},
 year={1982},
 publisher={Państwowe Wydawnictwo Naukowe},
 language={eng},
 type={Text},
 title={A counterexample to J. de Groot's conjecture cmp=def},
}