@article{CMH_1961__36_139223,
     author = {Margrit Frei},
     title = {\"Uber die subnormalen {L\"osungen} der {Differentialgleichung} w... + e...   w' + konst. ... {W} = 0.},
     journal = {Commentarii mathematici Helvetici},
     pages = {1--8},
     publisher = {mathdoc},
     volume = {36},
     year = {1961},
     zbl = {0115.06904},
     url = {http://geodesic.mathdoc.fr/item/CMH_1961__36_139223/}
}