@article{VMJ_2005_7_2_a7,
     author = {R. Ch. Kulaev},
     title = {An integral transformation on a graph for a second-order differential operator},
     journal = {Vladikavkazskij matemati\v{c}eskij \v{z}urnal},
     pages = {78--85},
     publisher = {mathdoc},
     volume = {7},
     number = {2},
     year = {2005},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/VMJ_2005_7_2_a7/}
}