@article{AULFM_1984_01_a8,
     author = {Niewiarowski, Jerzy},
     title = {Porosity preserving homeomorphisms},
     journal = {Acta Universitatis Lodziensis. Folia Mathematica},
     year = {1984},
     volume = {01},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/AULFM_1984_01_a8/}
}