De França JA, Carvalho NA, Pereira CC, Vieira ET. The Operational Sustainability of the Firm : The operational performance versus financial solvency binomial - OPFS . Int J Innov Educ Res [Internet]. 2021 Jan. 1 [cited 2024 Dec. 22];9(1):353-70. Available from: https://scholarsjournal.net/index.php/ijier/article/view/2909