%0 Journal Article %A T. Leżański %T The Fredholm Theory of Linear Equations in Banach spaces %J Studia Mathematica %D 1953 %P 244-276 %V 13 %N 2 %U http://geodesic.mathdoc.fr/articles/10.4064/sm-13-2-244-276/ %R 10.4064/sm-13-2-244-276 %G en %F 10_4064_sm_13_2_244_276