Quasi-stationary states of an electron with linearly dependent effective mass in an open nanostructure within transmission coefficient and S-matrix methodsJulia Seti, Mykola Tkach and Oxana VoitsekhivskaEur. Phys. J. Plus, 133 3 (2018) 90DOI: https://doi.org/10.1140/epjp/i2018-11921-4