@article{CMH_1963__38_139276,
     author = {Leo Sario},
     title = {An {Integral} {Equation} and a {General} {Existence} {Theorem} for {Harmonic} {Functions.}},
     journal = {Commentarii mathematici Helvetici},
     pages = {284--292},
     publisher = {mathdoc},
     volume = {38},
     year = {1963},
     zbl = {0132.30601},
     url = {http://geodesic.mathdoc.fr/item/CMH_1963__38_139276/}
}