WASET
    J. J. Peña and  J. Morales and  J. García-Ravelo and  L. Arcos-Díaz,  Schrödinger Equation with Position-Dependent Mass: Staggered Mass Distributions.   journal   = {International Journal of Physical and Mathematical Sciences}, [online]. World Academy of Science, Engineering and Technology.
    June 2017, vol. 128(8). 343 - 346
    [viewed 27 April 2024]. Available from: https://publications.waset.org/pdf/10007521.