Schomburg, E., Henini, M., Chamberlain, J., Steenson, D., Brandl, S., Hofbeck, K., …Wegscheider, W. (1999). Self-sustained current oscillation above 100 GHz in a GaAs/AlAs superlattice. Applied Physics Letters, 74(15), 2179-2181. https://doi.org/10.1063/1.123793