Moreira de Oliveira, Camylla, and Oldrich Joel Romero. “Approximate Calculation Model and Gibbs Model to Determine Operating Parameters of the Sucker-Rod Pumping System”. Latin American Journal of Energy Research, vol. 8, no. 1, July 2021, pp. 67-85, https://doi.org/10.21712/lajer.2021.v8.n1.p67-85.