@article{SM_1974_24_4_a5,
     author = {M. A. Shubin},
     title = {Differential and pseudodifferential operators in spaces of almost periodic functions},
     journal = {Sbornik. Mathematics},
     pages = {547--573},
     year = {1974},
     volume = {24},
     number = {4},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_1974_24_4_a5/}
}