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},
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     volume = {Ser. 4, 26},
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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. http://www.numdam.org/articles/10.24033/asens.1670/

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