%0 Journal Article %A T. V. Nagnibeda %T An estimate from above of spectral radii of random walks on surface groups %J Zapiski Nauchnykh Seminarov POMI %D 1997 %P 154-165 %V 240 %I mathdoc %U http://geodesic.mathdoc.fr/item/ZNSL_1997_240_a11/ %G ru %F ZNSL_1997_240_a11