Oliveira , A., R. Melo, and J. Santos. “Sunflower Consortium With Cowpea Productive Performance in Underground Dam With Irrigation Supplementary”. ITEGAM-JETIA, Vol. 3, no. 10, June 2017, pp. 169-73, https://itegam-jetia.org/journal/index.php/jetia/article/view/111.