@article{DE_1997_33_6_a11,
     author = {A. B. Antonevich and A. V. Lebedev},
     title = {Nonlocal pseudo-differential operators: index and {Lefschetz} numbers},
     journal = {Differencialʹnye uravneni\^a},
     pages = {795--799},
     publisher = {mathdoc},
     volume = {33},
     number = {6},
     year = {1997},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1997_33_6_a11/}
}