Suppressed absolute negative conductance and generation of high-frequency radiation in semiconductor superlatticesK. N. Alekseev, M. V. Gorkunov, N. V. Demarina, T. Hyart, N. V. Alexeeva and A. V. ShorokhovEurophys. Lett., 73 6 (2006) 934-940DOI: https://doi.org/10.1209/epl/i2005-10484-4