SATOH, A., and Y. TANAKA. “Equivalence of Cournot and Bertrand Equilibria in Duopoly under Relative Profit Maximization: A General Analysis”. Journal of Economics and Political Economy, vol. 3, no. 3, Sept. 2016, pp. 513-2, https://journals.econsciences.com/index.php/JEPE/article/view/986.