@article{MZ_1972__129_171838,
     author = {Lars Inge Hedberg},
     title = {Non-Linear {Potentials} and {Approximation} in the {Mean} by {Analytic} {Functions.}},
     journal = {Mathematische Zeitschrift},
     pages = {299--320},
     publisher = {mathdoc},
     volume = {129},
     year = {1972},
     zbl = {0236.31010},
     url = {http://geodesic.mathdoc.fr/item/MZ_1972__129_171838/}
}