R. D. Gámez Pitre, E. Palma Cardoso, and L. G. Beltrán Villalobos, “PLANNING AND FINANCIAL PROFITABILITY IN COMPANIES PROVIDING ELECTROSUMERGIBLE PUMPING SERVICES IN PDVSA, VENEZUELA”, innovajournal, vol. 7, no. 1, pp. 78–87, Dec. 2020.