@article{IM_1994__117_1_144217,
     author = {J.M. Landsberg},
     title = {On second fundamental forms of projective varieties.},
     journal = {Inventiones mathematicae},
     pages = {303--316},
     publisher = {mathdoc},
     volume = {117},
     number = {1},
     year = {1994},
     zbl = {0840.14025},
     url = {http://geodesic.mathdoc.fr/item/IM_1994__117_1_144217/}
}