Convergence of sequences of real functions with respect to small systems Jerzy Niewiarowski — 1988 Mathematica Slovaca
Some remarks about homeomorphisms preserving (f)-porosity Niewiarowski, Jerzy Acta Universitatis Lodziensis. Folia Mathematica
Porosity preserving homeomorphisms Niewiarowski, Jerzy Acta Universitatis Lodziensis. Folia Mathematica