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@article{IM_1991__106_1_143941, author = {N.I. Shepherd-Barron}, title = {Unstable vector bundles and linear systems on surfaces in characteristic p.}, journal = {Inventiones mathematicae}, pages = {243--262}, publisher = {mathdoc}, volume = {106}, number = {1}, year = {1991}, zbl = {0769.14006}, url = {http://geodesic.mathdoc.fr/item/IM_1991__106_1_143941/} }
N.I. Shepherd-Barron. Unstable vector bundles and linear systems on surfaces in characteristic p.. Inventiones mathematicae, Tome 106 (1991) no. 1, pp. 243-262. http://geodesic.mathdoc.fr/item/IM_1991__106_1_143941/