@article{IVM_1962_1_a6,
     author = {I. S. Kac},
     title = {On the genus of the spectrum of a singular string},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {57--64},
     publisher = {mathdoc},
     number = {1},
     year = {1962},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_1962_1_a6/}
}