@article{IM_1981__65_142837,
     author = {R. Sridharan and R. Parimala and M.A. Knus},
     title = {Non-free {Projective} {Modules} {Over} {IH[X,} {Y]} and {Stable} {Bundles} {Over} {IP2(...).}},
     journal = {Inventiones mathematicae},
     pages = {13--28},
     publisher = {mathdoc},
     volume = {65},
     year = {1981},
     zbl = {0474.14012},
     url = {http://geodesic.mathdoc.fr/item/IM_1981__65_142837/}
}