E. A. Bastos, M. V. Folegatti, R. T. de Faria, A. S. de A. Júnior, and M. J. Cardoso, “Simulation of growth and development of irrigated cowpea in Piauí State by CROPGRO model”, PAB, vol. 37, no. 10, pp. 1381–1387, Oct. 2002.