@article{IVM_1976_7_a0,
     author = {V. V. Borzov},
     title = {The spectrum of a~singular string},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {3--10},
     year = {1976},
     number = {7},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_1976_7_a0/}
}