@article{MAN_1923__90_159029,
     author = {A. Wiman},
     title = {\"Uber die reellen {Z\"uge} der ebenen algebraischen {Kurven}},
     journal = {Mathematische Annalen},
     pages = {222--228},
     publisher = {mathdoc},
     volume = {90},
     year = {1923},
     zbl = {49.0453.01},
     url = {http://geodesic.mathdoc.fr/item/MAN_1923__90_159029/}
}