Kovalenko, V., and V. Kotok. “‘The Popcorn effect’: Obtaining of the Highly Active Ultrafine Nickel Hydroxide by Microwave Treatment of Wet Precipitate”. Eastern-European Journal of Enterprise Technologies, vol. 5, no. 6 (95), Sept. 2018, pp. 12-20, doi:10.15587/1729-4061.2018.143126.