@article{MZ_1996__222_3_174896,
     author = {Adam Harris},
     title = {A removable singularities theorem for families for ruled surfaces.},
     journal = {Mathematische Zeitschrift},
     pages = {479--494},
     publisher = {mathdoc},
     volume = {222},
     number = {3},
     year = {1996},
     zbl = {0864.32011},
     url = {http://geodesic.mathdoc.fr/item/MZ_1996__222_3_174896/}
}