@article{JMAG_2012_8_3_a4,
     author = {L. Kobyakova},
     title = {Spectral problem generated by the equation of smooth string with piece-wise constant friction},
     journal = {\v{Z}urnal matemati\v{c}eskoj fiziki, analiza, geometrii},
     pages = {280--295},
     year = {2012},
     volume = {8},
     number = {3},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/JMAG_2012_8_3_a4/}
}