@article{RM_1979_34_2_a2,
     author = {M. A. Shubin},
     title = {The spectral theory and the index of elliptic operators with almost periodic coefficients},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     pages = {109--157},
     publisher = {mathdoc},
     volume = {34},
     number = {2},
     year = {1979},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/RM_1979_34_2_a2/}
}