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\bibitem{Rasulova_etal2012} Rasulova GK, Brunkov PN, Pentin IV, Egorov AY, Knyazev DA, Andrianov AV, et al. A weakly coupled semiconductor superlattice as a potential for a radio frequency modulated terahertz light emitter. Appl Phys Lett. 2012;100(13):131104 (1 to 4).

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