Souza, Rogéria Pereira, et al. “Photosynthesis and Accumulation of Solutes in Cowpea Plants Subjected to Salinity”. Pesquisa Agropecuaria Brasileira, vol. 46, no. 6, Aug. 2011, pp. 586-92, doi:10.1590/S1678-3921.pab2011.v46.9859.