@article{ASENS_1991_4_24_5_605_0, author = {Bangert, Victor and Schroeder, Viktor}, title = {Existence of flat tori in analytic manifolds of nonpositive curvature}, journal = {Annales scientifiques de l'\'Ecole Normale Sup\'erieure}, volume = {24}, year = {1991}, pages = {605-634}, doi = {10.24033/asens.1638}, mrnumber = {92k:53110}, zbl = {0760.53032}, language = {en}, url = {http://dml.mathdoc.fr/item/ASENS_1991_4_24_5_605_0} }
Bangert, V.; Schroeder, V. Existence of flat tori in analytic manifolds of nonpositive curvature. Annales scientifiques de l'École Normale Supérieure, Tome 24 (1991) pp. 605-634. doi : 10.24033/asens.1638. http://gdmltest.u-ga.fr/item/ASENS_1991_4_24_5_605_0/
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