Kotok, V., and V. Kovalenko. “Investigation of the Properties of Ni(OH)2 Electrochrome Films Obtained in the Presence of Different Types of Polyvinyl Alcohol”. Eastern-European Journal of Enterprise Technologies, vol. 4, no. 6 (94), Aug. 2018, pp. 42-47, doi:10.15587/1729-4061.2018.140560.