%0 Journal Article %A Ševčík, Jan %T Weak nonlinearity in a model which arises from the Helmert transformation %J Applications of Mathematics %D 2003 %P 161-174 %V 48 %N 3 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.1023/A:1026098228348/ %R 10.1023/A:1026098228348 %G en %F 10_1023_A_1026098228348