@article{pusep_2006,  title={Coherence of elementary excitations in disordered GaAs/AlGaAs superlattices},  volume={36},  ISSN={0103-9733},  url={https://doi.org/10.1590/S0103-97332006000600027},  DOI={10.1590/S0103-97332006000600027},  number={3b},  journal={Brazilian Journal of Physics},  publisher={Sociedade Brasileira de Física},  author={Pusep, Yu. A.},  year={2006},  month={Sep},  pages={902–904} }