Peña Orozco, D. L., S. Palomino-Rengifo, J. A. Álvarez, and L. Rivera Cadavid. “Flexible Quantity Contract Applied in a Small Agricultural Producers Supply Chain”. Scientia Et Technica, vol. 26, no. 03, Sept. 2021, pp. 316-27, doi:10.22517/23447214.24503.