@article{AFM_1975_581-600_a15,
     author = {D. Aharonov and S. Friedland},
     title = {On functions of bounded boundary rotation},
     journal = {Annales Fennici Mathematici},
     publisher = {mathdoc},
     volume = {581-600},
     year = {1975},
     doi = {10.5186/aasfm.1975.585},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.5186/aasfm.1975.585/}
}