@article{IVM_1974_7_a3,
     author = {I. S. Kats},
     title = {A~description of the set of spectral functions of a~regular string supporting a~concentrated mass at an end that is free of boundary conditions},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {27--33},
     publisher = {mathdoc},
     number = {7},
     year = {1974},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_1974_7_a3/}
}