@article{RM_1982_37_2_a16,
     author = {S. M. Kozlov and M. A. Shubin},
     title = {On the structure of functions of class $S$ of self-adjoint elliptic operators on $\mathbb R^n$},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     pages = {221--222},
     publisher = {mathdoc},
     volume = {37},
     number = {2},
     year = {1982},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/RM_1982_37_2_a16/}
}