Introducing a topology by an operation of a set-theoretic boundary Chądzyńska, Alina; Pustelnik, Mirosław Acta Universitatis Lodziensis. Folia Mathematica
On local one-parameter groups ot local transformations in differential spaces Banaszczyk, Maria Zofia; Chądzyńska, Alina Acta Universitatis Lodziensis. Folia Mathematica