@article{SM_2015_206_2_a4,
     author = {M. Ya. Mazalov and P. V. Paramonov},
     title = {Criteria for $C^m$-approximability by bianalytic functions on planar compact sets},
     journal = {Sbornik. Mathematics},
     pages = {242--281},
     publisher = {mathdoc},
     volume = {206},
     number = {2},
     year = {2015},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_2015_206_2_a4/}
}