@article{PMIHES_1980__51__137_0, author = {Katok, Anatole}, title = {Lyapunov exponents, entropy and periodic orbits for diffeomorphisms}, journal = {Publications Math\'ematiques de l'IH\'ES}, pages = {137--173}, publisher = {Institut des Hautes \'Etudes Scientifiques}, volume = {51}, year = {1980}, mrnumber = {573822}, zbl = {0445.58015}, language = {en}, url = {http://archive.numdam.org/item/PMIHES_1980__51__137_0/} }