@misc{Harčenko_Vladislav_Kirillovič_(1953–_)_A_1981, author={Harčenko, Vladislav Kirillovič (1953– ) and Laffey, Thomas J. and Zemánek, Jaroslav (1946–2017)}, volume={29}, number={1-2}, editor={Państwowe Wydawnictwo Naukowe (1951–1992)}, editor={Polska Akademia Nauk.}, copyright={Rights Reserved - Restricted Access}, address={Varsovie}, howpublished={online}, year={1981}, publisher={Państwowe Wydawnictwo Naukowe}, language={eng}, type={Text}, title={A characterization of central idempotents}, }