@article{PPN356556735_0055+dmdlog20,
title = {The Modular Symbol and Continued Fractions in Higher Dimensions.},
journal = {Inventiones mathematicae},
volume = {55},
year = {1979},
pages = {241-250},
zbl = {0426.10023},
url = {http://dml.mathdoc.fr/item/PPN356556735_0055+dmdlog20}
}
Ash, Avner; Rudolph, Lee. The Modular Symbol and Continued Fractions in Higher Dimensions.. Inventiones mathematicae, Tome 55 (1979) pp. 241-250. http://gdmltest.u-ga.fr/item/PPN356556735_0055+dmdlog20/