%0 Journal Article
%A H. Pawlak
%A R. Pawlak
%T On some properties of closed functions in terms of their levels
%J Commentationes Mathematicae
%D 1986
%P  81-87
%V 26
%N 1
%I mathdoc
%U http://geodesic.mathdoc.fr/articles/10.14708/cm.v26i1.6154/
%R 10.14708/cm.v26i1.6154
%G pl
%F 10_14708_cm_v26i1_6154