@article{VMJ_2013_15_4_a3,
     author = {R. Ch. Kulaev},
     title = {On the sing of the {Green's} function of the boundary value problem for the fourth-order equation on a~graph},
     journal = {Vladikavkazskij matemati\v{c}eskij \v{z}urnal},
     pages = {19--29},
     publisher = {mathdoc},
     volume = {15},
     number = {4},
     year = {2013},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/VMJ_2013_15_4_a3/}
}