Observation of nonequilibrium libration states in a single-junction superconducting quantum interferometerE. Il'ichev, M. V. Fistul, B. A. Malomed, H. E. Hoenig and H.-G. MeyerEurophys. Lett., 54 4 (2001) 515-521DOI: https://doi.org/10.1209/epl/i2001-00277-9