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@article{MS2_1978__43_166627, author = {Urban Cegrell}, title = {Delta-plusharmonic functions.}, journal = {Mathematica Scandinavica}, pages = {343--352}, publisher = {mathdoc}, volume = {43}, year = {1978}, zbl = {0393.31006}, url = {http://geodesic.mathdoc.fr/item/MS2_1978__43_166627/} }
Urban Cegrell. Delta-plusharmonic functions.. Mathematica Scandinavica, Tome 43 (1978), pp. 343-352. http://geodesic.mathdoc.fr/item/MS2_1978__43_166627/