%0 Journal Article %A W. Mlak %T Limitations and dependence on parameter of solutions of non-stationary differential operator equations %J Annales Polonici Mathematici %D 1959 %P 305-322 %V 6 %N 3 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4064/ap-6-3-305-322/ %R 10.4064/ap-6-3-305-322 %G en %F 10_4064_ap_6_3_305_322