no. 1
Some constancy results for nematic liquid crystals and harmonic maps
Annales de l'I.H.P. Analyse non linéaire, Tome 12 (1995) no. 1, pp. 99-115. 
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     author = {Chou, Kai Seng and Zhu, Xi-Ping},
     title = {Some constancy results for nematic liquid crystals and harmonic maps},
     journal = {Annales de l'I.H.P. Analyse non lin\'eaire},
     pages = {99--115},
     publisher = {Gauthier-Villars},
     volume = {12},
     number = {1},
     year = {1995},
     zbl = {0843.35027},
     language = {en},
     url = {http://archive.numdam.org/item/AIHPC_1995__12_1_99_0/}
}
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Chou, Kai Seng; Zhu, Xi-Ping. Some constancy results for nematic liquid crystals and harmonic maps. Annales de l'I.H.P. Analyse non linéaire, Tome 12 (1995) no. 1, pp. 99-115. http://archive.numdam.org/item/AIHPC_1995__12_1_99_0/

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