@article{MS2_1959__7_165703,
     author = {Gunnar af H\"allstr\"om},
     title = {Bemerkungen \"uber {Halbvertauschbarkeit} ganzer {Funktionen.}},
     journal = {Mathematica Scandinavica},
     pages = {61--70},
     year = {1959},
     volume = {7},
     zbl = {0090.04801},
     url = {http://geodesic.mathdoc.fr/item/MS2_1959__7_165703/}
}