Lopes, Ângela C. de A. (2001) “Genetic variability and correlations of agronomic characters in cowpea (<i>Vigna unguiculata</i>)”, Pesquisa Agropecuaria Brasileira, 36(3), pp. 515–520. doi: 10.1590/S1678-3921.pab2001.v36.6166.