Pham Ngoc Thang and  Le Thai Hung and  Nguyen Quang Bau,  Influence of Confined Acoustic Phonons on the Shubnikov – de Haas Magnetoresistance Oscillations in a Doped Semiconductor Superlattice.   journal   = {International Journal of Physical and Mathematical Sciences}, [online]. World Academy of Science, Engineering and Technology.
    July 2017, vol. 128(8). 386 - 389
    [viewed 15 November 2019]. Available from: https://publications.waset.org/pdf/10007744.