@article{GDZPPN002102455,
title = {Changing rotation intervals of endomorphisms of the circle.},
journal = {Inventiones mathematicae},
volume = {83},
year = {1986},
pages = {257-264},
zbl = {0603.58036},
url = {http://dml.mathdoc.fr/item/GDZPPN002102455}
}
Bamon, R.; Malta, I.; Pacífico, M.J. Changing rotation intervals of endomorphisms of the circle.. Inventiones mathematicae, Tome 83 (1986) pp. 257-264. http://gdmltest.u-ga.fr/item/GDZPPN002102455/