Kurudzhi, Y., I. Moskvichenko, and M. Postan. “Method of Finding Equilibrium Solutions for Duopoly of Supply Chains Taking into Account the Innovation Activity of Enterprises”. Eastern-European Journal of Enterprise Technologies, vol. 3, no. 4 (87), June 2017, pp. 25-30, doi:10.15587/1729-4061.2017.103989.