no. 2
An excess sphere theorem
Annales scientifiques de l'École Normale Supérieure, Série 4, Tome 26 (1993) no. 2, pp. 175-188 
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     author = {Petersen, Peter and Zhu, Shun-Hui},
     title = {An excess sphere theorem},
     journal = {Annales scientifiques de l'\'Ecole Normale Sup\'erieure},
     pages = {175--188},
     year = {1993},
     publisher = {Elsevier},
     volume = {Ser. 4, 26},
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     language = {en},
     url = {https://www.numdam.org/articles/10.24033/asens.1670/}
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Petersen, Peter; Zhu, Shun-Hui. An excess sphere theorem. Annales scientifiques de l'École Normale Supérieure, Série 4, Tome 26 (1993) no. 2, pp. 175-188. doi: 10.24033/asens.1670

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