@article{VMUMM_1986_1_a17,
     author = {A. V. Savin},
     title = {Rotation number for almost periodic {Dirac} operators},
     journal = {Vestnik Moskovskogo universiteta. Matematika, mehanika},
     pages = {62--65},
     year = {1986},
     number = {1},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/VMUMM_1986_1_a17/}
}