De França, J. A., Carvalho, N. A., Pereira, C. C., & Vieira, E. T. . (2021). The Operational Sustainability of the Firm : The operational performance versus financial solvency binomial - OPFS . International Journal for Innovation Education and Research, 9(1), 353-370. https://doi.org/10.31686/ijier.vol9.iss1.2909