@article{AIHPC_1993__10_2_239_0,
     author = {Greco, Carlo},
     title = {The {Dirichlet-problem} for harmonic maps from the disk into a lorentzian warped product},
     journal = {Annales de l'I.H.P. Analyse non lin\'eaire},
     pages = {239--252},
     publisher = {Gauthier-Villars},
     volume = {10},
     number = {2},
     year = {1993},
     mrnumber = {1220035},
     zbl = {0784.58020},
     language = {en},
     url = {http://archive.numdam.org/item/AIHPC_1993__10_2_239_0/}
}