@article{1104115431,
author = {Wojtkowski, Maciej},
title = {Principles for the design of billiards with nonvanishing Lyapunov exponents},
journal = {Comm. Math. Phys.},
volume = {102},
number = {4},
year = {1986},
pages = { 391-414},
language = {en},
url = {http://dml.mathdoc.fr/item/1104115431}
}
Wojtkowski, Maciej. Principles for the design of billiards with nonvanishing Lyapunov exponents. Comm. Math. Phys., Tome 102 (1986) no. 4, pp. 391-414. http://gdmltest.u-ga.fr/item/1104115431/