@article{1102637371, author = {Botelho, F.}, title = {Rotational entropy for annulus endomorphisms.}, journal = {Pacific J. Math.}, volume = {151}, number = {2}, year = {1991}, pages = { 1-19}, language = {en}, url = {http://dml.mathdoc.fr/item/1102637371} }
Botelho, F. Rotational entropy for annulus endomorphisms.. Pacific J. Math., Tome 151 (1991) no. 2, pp. 1-19. http://gdmltest.u-ga.fr/item/1102637371/