@article{GDZPPN002109670,
title = {Polynomial periodicity for Betti numbers of covering surfaces.},
journal = {Inventiones mathematicae},
volume = {110},
year = {1992},
pages = {289-322},
zbl = {0776.14002},
url = {http://dml.mathdoc.fr/item/GDZPPN002109670}
}
Hironaka, Eriko. Polynomial periodicity for Betti numbers of covering surfaces.. Inventiones mathematicae, Tome 110 (1992) pp. 289-322. http://gdmltest.u-ga.fr/item/GDZPPN002109670/