@article{AULFM_1989_03_a0,
     author = {Pawlak, Ryszard J.},
     title = {On {\'Swi\k{a}tkowski} {Functions}},
     journal = {Acta Universitatis Lodziensis. Folia Mathematica},
     year = {1989},
     volume = {03},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/AULFM_1989_03_a0/}
}