no. 3
Indice de Morse des applications harmoniques de la sphère
Compositio Mathematica, Tome 95 (1995) no. 3, pp. 343-362. 
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     number = {3},
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     mrnumber = {1318092},
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     url = {http://www.numdam.org/item/CM_1995__95_3_343_0/}
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El Soufi, Ahmad. Indice de Morse des applications harmoniques de la sphère. Compositio Mathematica, Tome 95 (1995) no. 3, pp. 343-362. http://www.numdam.org/item/CM_1995__95_3_343_0/

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