@article{1178228288,
author = {Earle, Clifford J. and Kra, Irwin},
title = {Positive divisors and Poincar\'e series on variable Riemann surfaces},
journal = {Tohoku Math. J. (2)},
volume = {39},
number = {4},
year = {1987},
pages = { 429-436},
language = {en},
url = {http://dml.mathdoc.fr/item/1178228288}
}
Earle, Clifford J.; Kra, Irwin. Positive divisors and Poincaré series on variable Riemann surfaces. Tohoku Math. J. (2), Tome 39 (1987) no. 4, pp. 429-436. http://gdmltest.u-ga.fr/item/1178228288/