@article{FAA_1979_13_4_a15,
     author = {Yu. V. Kogan},
     title = {Trace formulas for a spectral boundary problem},
     journal = {Funkcionalʹnyj analiz i ego prilo\v{z}eni\^a},
     pages = {75--76},
     year = {1979},
     volume = {13},
     number = {4},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/FAA_1979_13_4_a15/}
}