@article{MMO_2019_80_2_a1,
     author = {V. A. Sadovnichii and Ya. T. Sultanaev and A. M. Akhtyamov},
     title = {The finiteness of the spectrum of boundary value problems defined on a geometric graph},
     journal = {Trudy Moskovskogo matemati\v{c}eskogo ob\^{s}estva},
     pages = {147--156},
     publisher = {mathdoc},
     volume = {80},
     number = {2},
     year = {2019},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MMO_2019_80_2_a1/}
}