@article{FAA_1979_13_4_a6,
     author = {M. S. Agranovich},
     title = {Spectral properties of elliptic pseudodifferential operators on a closed curve},
     journal = {Funkcionalʹnyj analiz i ego prilo\v{z}eni\^a},
     pages = {54--56},
     publisher = {mathdoc},
     volume = {13},
     number = {4},
     year = {1979},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/FAA_1979_13_4_a6/}
}