@article{AFM_1975_581-600_a5,
     author = {WE. Kirwan},
     title = {Extremal problems for functions with bounded boundary rotation},
     journal = {Annales Fennici Mathematici},
     year = {1975},
     volume = {581-600},
     doi = {10.5186/aasfm.1975.595},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.5186/aasfm.1975.595/}
}