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@article{IM_1980__56_142700, author = {Ian Morrison}, title = {Projective {Stability} of {Ruled} {Surfaces.}}, journal = {Inventiones mathematicae}, pages = {269--304}, publisher = {mathdoc}, volume = {56}, year = {1980}, zbl = {0423.14005}, url = {http://geodesic.mathdoc.fr/item/IM_1980__56_142700/} }
Ian Morrison. Projective Stability of Ruled Surfaces.. Inventiones mathematicae, Tome 56 (1980), pp. 269-304. http://geodesic.mathdoc.fr/item/IM_1980__56_142700/