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@article{JRAM_1988__390_153057, author = {Viktor Schroeder}, title = {Existence of immersed tori in manifolds of nonpositive curvature.}, journal = {Journal f\"ur die reine und angewandte Mathematik}, pages = {32--46}, publisher = {mathdoc}, volume = {390}, year = {1988}, zbl = {0641.53042}, url = {http://geodesic.mathdoc.fr/item/JRAM_1988__390_153057/} }
Viktor Schroeder. Existence of immersed tori in manifolds of nonpositive curvature.. Journal für die reine und angewandte Mathematik, Tome 390 (1988), pp. 32-46. http://geodesic.mathdoc.fr/item/JRAM_1988__390_153057/