@article{00902752,
title = {Harmonic morphisms between semi-Riemannian manifolds.},
journal = {Annales Academiae Scientiarum Fennicae. Mathematica},
volume = {21},
year = {1996},
pages = {31-50},
zbl = {0847.53013},
language = {en},
url = {http://dml.mathdoc.fr/item/00902752}
}
Fuglede, Bent. Harmonic morphisms between semi-Riemannian manifolds.. Annales Academiae Scientiarum Fennicae. Mathematica, Tome 21 (1996) pp. 31-50. http://gdmltest.u-ga.fr/item/00902752/