%0 Journal Article %A M. N. Yakovlev %T Implicit functions determined by equations with unbounded operators and the solvability of operator equations %J Zapiski Nauchnykh Seminarov POMI %D 1998 %P 216-224 %V 248 %I mathdoc %U http://geodesic.mathdoc.fr/item/ZNSL_1998_248_a10/ %G ru %F ZNSL_1998_248_a10