On the boundary controllability of dynamical system described by the wave equation on a class of graphs (on trees). Belishev, M.I. — 2004 Journal of Mathematical Sciences (New York)
Reconstruction of the parameters of a system of connected beams from dynamic boundary measurements. Belishev, M.I.; Ivanov, S.A. — 2005 Zapiski Nauchnykh Seminarov POMI