@article{IM2_1991_36_3_a0,
     author = {I. V. Artamkin},
     title = {Deforming torison-free sheaves on an algebraic surface},
     journal = {Izvestiya. Mathematics },
     pages = {449--485},
     publisher = {mathdoc},
     volume = {36},
     number = {3},
     year = {1991},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/IM2_1991_36_3_a0/}
}