@article{IM2_1999_63_4_a7,
     author = {A. P. Soldatov},
     title = {On the index of operators with end symbol},
     journal = {Izvestiya. Mathematics},
     pages = {791--825},
     year = {1999},
     volume = {63},
     number = {4},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/IM2_1999_63_4_a7/}
}