METHODOLOGICAL NOTES: Asynchronous excitation of undamped oscillations Penner, D. I. ; Duboshinskiĭ, D. B. ; Kozakov, M. I. ; Vermel', A. S. ; Galkin, Yu V. Abstract Publication: Soviet Physics Uspekhi Pub Date: January 1973 DOI: 10.1070/PU1973v016n01ABEH005156 Bibcode: 1973SvPhU..16..158P