@article{1102977527,
author = {Helfenstein, H. G.},
title = {Local isometries of flat tori.},
journal = {Pacific J. Math.},
volume = {35},
number = {3},
year = {1970},
pages = { 113-117},
language = {en},
url = {http://dml.mathdoc.fr/item/1102977527}
}
Helfenstein, H. G. Local isometries of flat tori.. Pacific J. Math., Tome 35 (1970) no. 3, pp. 113-117. http://gdmltest.u-ga.fr/item/1102977527/