Removability of singularities of harmonic maps into pseudo-riemannian manifolds
Annales de la Faculté des sciences de Toulouse : Mathématiques, Série 6, Tome 13 (2004) no. 1, pp. 45-71. 
@article{AFST_2004_6_13_1_45_0,
     author = {H\'elein, Fr\'ed\'eric},
     title = {Removability of singularities of harmonic maps into pseudo-riemannian manifolds},
     journal = {Annales de la Facult\'e des sciences de Toulouse : Math\'ematiques},
     pages = {45--71},
     publisher = {Universit\'e Paul Sabatier, Institut de math\'ematiques},
     address = {Toulouse},
     volume = {Ser. 6, 13},
     number = {1},
     year = {2004},
     mrnumber = {2060029},
     zbl = {1061.58014},
     language = {en},
     url = {http://archive.numdam.org/item/AFST_2004_6_13_1_45_0/}
}
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Hélein, Frédéric. Removability of singularities of harmonic maps into pseudo-riemannian manifolds. Annales de la Faculté des sciences de Toulouse : Mathématiques, Série 6, Tome 13 (2004) no. 1, pp. 45-71. http://archive.numdam.org/item/AFST_2004_6_13_1_45_0/

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