@article{FORUM_1992__4_6_141673,
     author = {Edoardo Ballico},
     title = {On rank two vector bundles on an algebraic surface.},
     journal = {Forum mathematicum},
     pages = {231--242},
     publisher = {mathdoc},
     volume = {4},
     number = {6},
     year = {1992},
     zbl = {0753.14010},
     url = {http://geodesic.mathdoc.fr/item/FORUM_1992__4_6_141673/}
}