@article{IM_1986__83_143311,
     author = {R. Bamon and I. Malta and M.J. Pac{\'\i}fico},
     title = {Changing rotation intervals of endomorphisms of the circle.},
     journal = {Inventiones mathematicae},
     pages = {257--264},
     publisher = {mathdoc},
     volume = {83},
     year = {1986},
     zbl = {0603.58036},
     url = {http://geodesic.mathdoc.fr/item/IM_1986__83_143311/}
}