Electronic structure and thermoelectric properties of (Mg2X)2 / (Mg2Y)2 (X, Y = Si, Ge, Sn) superlattices from first-principle calculationsSan-Dong GuoEur. Phys. J. B, 89 5 (2016) 134DOI: https://doi.org/10.1140/epjb/e2016-60833-0