Aimaganbetov, K.P., et al. “Research of Electrophysical Properties of Solar Elements by Impedance Spectroscopy Method Using a Specially Designed Low Temperature Microcryogenic Measuring Cell”. Recent Contributions to Physics, vol. 2021, no. 1, Apr. 2021, pp. 68-74, https://doi.org/10.26577/RCPh.2021.v76.i1.08.