%0 Journal Article %A János Karátson %T Gradient method for non-injective operators in Hilbert space with application to Neumann problems %J Applicationes Mathematicae %D 1999 %P 333-346 %V 26 %N 3 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4064/am-26-3-333-346/ %R 10.4064/am-26-3-333-346 %G en %F 10_4064_am_26_3_333_346