@article{article054a152b,
title   = {Remarks on the passage through resonance of a vibrating system with two degrees of freedom, excited by a non-ideal energy source},
author = {Balthazar, José Manoel and Cheshankov, Bozhidar I. and Ruschev, D. T. and Barbanti, Luciano and Weber, H. I.},
year = {2001},
doi = {10.1006/jsvi.2000.3092},
journal   = {Journal of Sound and Vibration}
}