@article{DAN_1968_182_6_a10,
     author = {V. E. Shatalov and I. A. Shishmarev},
     title = {Dirichlet series for elliptic operators},
     journal = {Doklady Akademii Nauk},
     pages = {1280--1282},
     publisher = {mathdoc},
     volume = {182},
     number = {6},
     year = {1968},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1968_182_6_a10/}
}