Escobar Elexpuru, Gonzalo, and Iván Valdés de la Fuente. “Equilibrium in an Oligopoly Market With a Dominant Firm in the Payment Card Market ”. Journal of Quantitative Methods for Economics and Business Administration, vol. 33, June 2022, pp. 74-92, doi:10.46661/revmetodoscuanteconempresa.5567.