@article{CMH_1959__33_139162,
     author = {Maurice Heins},
     title = {On the {Principle} of {Harmonic} {Measure.}},
     journal = {Commentarii mathematici Helvetici},
     pages = {47--58},
     publisher = {mathdoc},
     volume = {33},
     year = {1959},
     zbl = {0083.06903},
     url = {http://geodesic.mathdoc.fr/item/CMH_1959__33_139162/}
}