no. 3
Quasiflats in Hadamard spaces
Annales scientifiques de l'École Normale Supérieure, Série 4, Tome 30 (1997) no. 3, pp. 339-352. 
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     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://archive.numdam.org/articles/10.1016/s0012-9593(97)89923-5/}
}
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Lang, Urs; Schroeder, Viktor. Quasiflats in Hadamard spaces. Annales scientifiques de l'École Normale Supérieure, Série 4, Tome 30 (1997) no. 3, pp. 339-352. doi : 10.1016/s0012-9593(97)89923-5. http://archive.numdam.org/articles/10.1016/s0012-9593(97)89923-5/

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