La géométrie métrique des variétés riemanniennes (variations sur la formule a 2 =b 2 +c 2 -2bccosα)
Élie Cartan et les mathématiques d'aujourd'hui - Lyon, 25-29 juin 1984, Astérisque, no. S131 (1985), pp. 9-66.
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     author = {Berger, Marcel},
     title = {La g\'eom\'etrie m\'etrique des vari\'et\'es riemanniennes (variations sur la formule $a^2 = b^2 + c^2 - 2bc \cos \alpha)$},
     booktitle = {\'Elie Cartan et les math\'ematiques d'aujourd'hui - Lyon, 25-29 juin 1984},
     series = {Ast\'erisque},
     pages = {9--66},
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     number = {S131},
     year = {1985},
     mrnumber = {837193},
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Berger, Marcel. La géométrie métrique des variétés riemanniennes (variations sur la formule $a^2 = b^2 + c^2 - 2bc \cos \alpha)$, in Élie Cartan et les mathématiques d'aujourd'hui - Lyon, 25-29 juin 1984, Astérisque, no. S131 (1985), pp. 9-66. http://www.numdam.org/item/AST_1985__S131__9_0/

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