de Araújo, P. S. R., de Oliveira, F. J. and Costa, M. C. B. (1991) “Preliminary evaluation of seed germination of winged bean and yam bean varieties”, Pesquisa Agropecuaria Brasileira, 26(6), pp. 857–861. doi: 10.1590/S1678-3921.pab1991.v26.3415.