@article{10_4153_CJM_1973_006_4,
     author = {Grassmann, E.},
     title = {The {Existence} of {Quadratic} {Differentials} in {Simply} {Connected} {Regions} of the {Complex} {Plane}},
     journal = {Canadian journal of mathematics},
     pages = {83--91},
     year = {1973},
     volume = {25},
     number = {1},
     doi = {10.4153/CJM-1973-006-4},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CJM-1973-006-4/}
}