@article{DAN_1972_202_4_a1,
     author = {N. L. Vasilevskii},
     title = {On the {Noether} conditions and a formula for the index of a class of integral operators},
     journal = {Doklady Akademii Nauk},
     pages = {747--750},
     publisher = {mathdoc},
     volume = {202},
     number = {4},
     year = {1972},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1972_202_4_a1/}
}