@article{ASENS_1997_4_30_3_339_0,
     author = {Lang, Urs and Schroeder, Viktor},
     title = {Quasiflats in {Hadamard} spaces},
     journal = {Annales scientifiques de l'\'Ecole Normale Sup\'erieure},
     pages = {339--352},
     publisher = {Elsevier},
     volume = {Ser. 4, 30},
     number = {3},
     year = {1997},
     doi = {10.1016/s0012-9593(97)89923-5},
     mrnumber = {98b:53035},
     zbl = {0876.53050},
     language = {en},
     url = {http://www.numdam.org/articles/10.1016/s0012-9593(97)89923-5/}
}