@article{JRAM_1995__459_153693,
     author = {Alexander Schmitt},
     title = {Deformations of ruled mainfolds.},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {213--218},
     publisher = {mathdoc},
     volume = {459},
     year = {1995},
     zbl = {0809.14028},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1995__459_153693/}
}