@misc{Płonka_Jerzy_On_1982,
 author={Płonka, Jerzy},
 volume={30},
 editor={Polska Akademia Nauk.},
 editor={Państwowe Wydawnictwo Naukowe (1951–1992)},
 number={7-8},
 copyright={Rights Reserved - Restricted Access},
 address={Varsovie},
 howpublished={online},
 year={1982},
 publisher={Państwowe Wydawnictwo Naukowe},
 language={eng},
 title={On the sum of a system of disjoint unary algebras corresponding to a given type},
 type={Text},
}