Bomba, A. and Moroz, I. 2021. Prediction of the charge carriers stationary distribution in the active region of the p-i-n structures by the perturbation theory methods. Bulletin of V.N. Karazin Kharkiv National University, series «Mathematical modeling. Information technology. Automated control systems». 50, (Jun. 2021), 27-36. DOI:https://doi.org/10.26565/2304-6201-2021-50-03.