%0 Journal Article %A Krzysztof J. Szajowski %T Cover of Special Chapter %J Mathematica Applicanda %D 2019 %P i-ii %V 47 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.14708/ma.v47i1.6509/ %R 10.14708/ma.v47i1.6509 %G pl %F 10_14708_ma_v47i1_6509