@misc{Lipińska_Jolanta_Pseudogroups,
 author={Lipińska Jolanta},
 howpublished={online},
 publisher={Wydaw. Politechniki Częstochowskiej},
 language={eng},
 type={artykuł},
 title={Pseudogroups of transformations on discrete topological spaces},
 keywords={pseudogrups of transformations, generalised inverse semigroups},
}