@article{MM2_1987__59_155250,
     author = {Alfonso Romero},
     title = {An {Extension} of {Calabi's} {Rigidity} theorem to complex submanifolds of indefinite complex space forms.},
     journal = {Manuscripta mathematica},
     pages = {261--276},
     publisher = {mathdoc},
     volume = {59},
     year = {1987},
     zbl = {0617.53055},
     url = {http://geodesic.mathdoc.fr/item/MM2_1987__59_155250/}
}