@article{MZM_1998_64_5_a5,
     author = {B. V. Karpov},
     title = {On the structure of rigid semistable sheaves on algebraic surfaces},
     journal = {Matemati\v{c}eskie zametki},
     pages = {692--700},
     year = {1998},
     volume = {64},
     number = {5},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1998_64_5_a5/}
}