%0 Journal Article %A Łukasz Stettner %T 7th International Congress on Industrial and Applied Mathematics – ICIAM 2011 %J Mathematica Applicanda %D 2011 %P 115-120 %V 39 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.14708/ma.v39i2.180/ %R 10.14708/ma.v39i2.180 %G pl %F 10_14708_ma_v39i2_180