@article{AFM_1967_391-410_a5,
     author = {Kurt Strebel},
     title = {Bemerkungen \"uber quadratische {Differentiale} mit geschlossenen {Trajektorien}},
     journal = {Annales Fennici Mathematici},
     year = {1967},
     volume = {391-410},
     doi = {10.5186/aasfm.1967.405},
     language = {de},
     url = {http://geodesic.mathdoc.fr/articles/10.5186/aasfm.1967.405/}
}