@article{VMJ_2008_10_3_a2,
     author = {R. Ch. Kulaev},
     title = {On the geometric multiplicity of the eigenvalues of a boundary value problem on a graph},
     journal = {Vladikavkazskij matemati\v{c}eskij \v{z}urnal},
     pages = {23--28},
     year = {2008},
     volume = {10},
     number = {3},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/VMJ_2008_10_3_a2/}
}