@article{ASENS_1993_4_26_2_175_0,
     author = {Petersen, Peter and Zhu, Shun-Hui},
     title = {An excess sphere theorem},
     journal = {Annales scientifiques de l'\'Ecole Normale Sup\'erieure},
     pages = {175--188},
     publisher = {Elsevier},
     volume = {Ser. 4, 26},
     number = {2},
     year = {1993},
     doi = {10.24033/asens.1670},
     zbl = {0771.53024},
     mrnumber = {1209707},
     language = {en},
     url = {http://www.numdam.org/articles/10.24033/asens.1670/}
}