@article{MS2_1967__20_165998,
     author = {Maurice Heins},
     title = {On the {Theorem} of {Szeg\"o-Solomentsev.}},
     journal = {Mathematica Scandinavica},
     pages = {281--289},
     publisher = {mathdoc},
     volume = {20},
     year = {1967},
     zbl = {0162.43002},
     url = {http://geodesic.mathdoc.fr/item/MS2_1967__20_165998/}
}