@article{SM_2015_206_1_a1,
     author = {A. Boivin and P. M. Gauthier and P. V. Paramonov},
     title = {Runge- and {Walsh-type} extensions of smooth subharmonic functions on open {Riemann} surfaces},
     journal = {Sbornik. Mathematics},
     pages = {3--23},
     year = {2015},
     volume = {206},
     number = {1},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_2015_206_1_a1/}
}