@article{02028910,
title = {The average length of a trajectory in a certain billiard in a flat two-torus.},
journal = {The New York Journal of Mathematics [electronic only]},
volume = {9},
year = {2003},
pages = {303-330},
zbl = {1066.37021},
language = {en},
url = {http://dml.mathdoc.fr/item/02028910}
}
Boca, F. P.; Gologan, R. N.; Zaharescu, A. The average length of a trajectory in a certain billiard in a flat two-torus.. The New York Journal of Mathematics [electronic only], Tome 9 (2003) pp. 303-330. http://gdmltest.u-ga.fr/item/02028910/