@article{IVM_2008_3_a4,
     author = {V. V. Provotorov},
     title = {Expansion in eigenfunctions of the {Sturm--Liouville} problem on a graph bundle},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {50--62},
     publisher = {mathdoc},
     number = {3},
     year = {2008},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_2008_3_a4/}
}