%0 Journal Article %A Vejvoda, O. %T On perturbed nonlinear boundary value problems %J Czechoslovak Mathematical Journal %D 1961 %P 323-364 %V 11 %N 3 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.21136/CMJ.1961.100464/ %R 10.21136/CMJ.1961.100464 %G en %F 10_21136_CMJ_1961_100464