Zaffaroni, E., Silva, M. A. V., & de Azevedo, P. V. (1994). Agroclimatic potential of sunflower in Paraiba State, Brazil. I. Temperature and solar radiatio. Pesquisa Agropecuaria Brasileira, 29(10), 1483–1491. https://doi.org/10.1590/S1678-3921.pab1994.v29.4199