@article{ZNSL_2004_308_a2,
     author = {M. I. Belishev},
     title = {On boundary controllability of dynamical system gouverned by the wave equation on a~class of graphs (trees)},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {23--47},
     publisher = {mathdoc},
     volume = {308},
     year = {2004},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_2004_308_a2/}
}