@article{AFM_1984_9_1_a5,
     author = {Sakari Toppila},
     title = {On a result of {Winkler}},
     journal = {Annales Fennici Mathematici},
     pages = {89--92},
     publisher = {mathdoc},
     volume = {9},
     number = {1},
     year = {1984},
     doi = {10.5186/aasfm.1984.0913},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.5186/aasfm.1984.0913/}
}