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R. R. Andruszkiewicz, M. Sobolewska
The powerly hereditary property in the lower radical construction
Recent Results in Pure and Applied Mathematics, Podlasie 2014, (A. Gomolińska, A. Grabowski, M. Hryniewicka, M. Kacprzak, E. Schmeidel Ed(s).), (publ. by) Politechnika Białostocka, 2014, pp. 23-31.