Говда, О. І., and Ю. І. Ковальчик. “THE CALCULATION OF DISCRETE STATES PROBABILITY OF SYSTEM WITH THREE UNITS OF HARVESTING TECHNIQUES”. Eastern-European Journal of Enterprise Technologies, vol. 1, no. 10(61), Feb. 2013, pp. 164-6, doi:10.15587/1729-4061.2013.6603.