@misc{HartmannVulcanovSchuette2009, author = {Carsten Hartmann and Valentina-Mira Vulcanov and Christof Sch{\"u}tte}, title = {Balanced truncation of linear second-order systems: a Hamiltonian approach}, institution = {Freie Universit{\"a}t Berlin}, type = {preprintmatheon}, year = {2009}, }