%0 Journal Article %A A. Boivin %A P. M. Gauthier %A P. V. Paramonov %T Runge- and Walsh-type extensions of smooth subharmonic functions on open Riemann surfaces %J Sbornik. Mathematics %D 2015 %P 3-23 %V 206 %N 1 %U http://geodesic.mathdoc.fr/item/SM_2015_206_1_a1/ %G en %F SM_2015_206_1_a1