no. 6
Equivariant harmonic maps between manifolds with metrics of (p,q)-signature
Annales de l'I.H.P. Analyse non linéaire, Tome 6 (1989) no. 6, pp. 503-524. 
@article{AIHPC_1989__6_6_503_0,
     author = {Ratto, Andrea},
     title = {Equivariant harmonic maps between manifolds with metrics of $(p, q)$-signature},
     journal = {Annales de l'I.H.P. Analyse non lin\'eaire},
     pages = {503--524},
     publisher = {Gauthier-Villars},
     volume = {6},
     number = {6},
     year = {1989},
     mrnumber = {1035340},
     zbl = {0703.58015},
     language = {en},
     url = {http://www.numdam.org/item/AIHPC_1989__6_6_503_0/}
}
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Ratto, Andrea. Equivariant harmonic maps between manifolds with metrics of $(p, q)$-signature. Annales de l'I.H.P. Analyse non linéaire, Tome 6 (1989) no. 6, pp. 503-524. http://www.numdam.org/item/AIHPC_1989__6_6_503_0/

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