@article{AA_1990_2_5_a6,
     author = {B. A. Plamenevskii and G. V. Rozenblum},
     title = {On the index of pseudodifferential operators with isolated singularities in the symbols},
     journal = {Algebra i analiz},
     pages = {165--188},
     publisher = {mathdoc},
     volume = {2},
     number = {5},
     year = {1990},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/AA_1990_2_5_a6/}
}