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@article{JRAM_1992__426_153413, author = {Wolfgang K. Seiler}, title = {Deformations of ruled surfaces.}, journal = {Journal f\"ur die reine und angewandte Mathematik}, pages = {203--219}, publisher = {mathdoc}, volume = {426}, year = {1992}, zbl = {0739.14022}, url = {http://geodesic.mathdoc.fr/item/JRAM_1992__426_153413/} }
Wolfgang K. Seiler. Deformations of ruled surfaces.. Journal für die reine und angewandte Mathematik, Tome 426 (1992), pp. 203-219. http://geodesic.mathdoc.fr/item/JRAM_1992__426_153413/