@article{VMUMM_1985_3_a19,
     author = {N. N. Yakovlev},
     title = {The spectrum of multidimensional pseudodifferential periodic operators},
     journal = {Vestnik Moskovskogo universiteta. Matematika, mehanika},
     pages = {80--81},
     year = {1985},
     number = {3},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/VMUMM_1985_3_a19/}
}