Cherkez, R.G., et al. “Influence of the Number of Channels on the Efficiency of Permeable Thermoelements of Bi-Te-Se-Sb Based Materials”. Journal of Thermoelectricity, no. 3, Aug. 2019, pp. 55-60, http://jte.ite.cv.ua/index.php/jt/article/view/81.