@article{IM2_1990_34_1_a6,
     author = {B. A. Plamenevskii and V. N. Senichkin},
     title = {The spectrum of an algebra of pseudodifferential operators with piecewise smooth symbols},
     journal = {Izvestiya. Mathematics},
     pages = {147--179},
     year = {1990},
     volume = {34},
     number = {1},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/IM2_1990_34_1_a6/}
}