@article{IM2_1986_26_3_a6,
     author = {M. A. Shubin},
     title = {Pseudodifference operators and their {Green's} functions},
     journal = {Izvestiya. Mathematics },
     pages = {605--622},
     publisher = {mathdoc},
     volume = {26},
     number = {3},
     year = {1986},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/IM2_1986_26_3_a6/}
}