The symmetry of minimizing harmonic maps from a two dimensional domain to the sphere
Annales de l'I.H.P. Analyse non linéaire, Volume 10 (1993) no. 5, p. 549-559 
@article{AIHPC_1993__10_5_549_0,
     author = {Sandier, \'Etienne},
     title = {The symmetry of minimizing harmonic maps from a two dimensional domain to the sphere},
     journal = {Annales de l'I.H.P. Analyse non lin\'eaire},
     publisher = {Gauthier-Villars},
     volume = {10},
     number = {5},
     year = {1993},
     pages = {549-559},
     zbl = {0797.35027},
     mrnumber = {1249106},
     language = {en},
     url = {http://www.numdam.org/item/AIHPC_1993__10_5_549_0}
}

Sandier, Étienne. The symmetry of minimizing harmonic maps from a two dimensional domain to the sphere. Annales de l'I.H.P. Analyse non linéaire, Volume 10 (1993) no. 5, pp. 549-559. http://www.numdam.org/item/AIHPC_1993__10_5_549_0/

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