M. S. Borges, B. F. Viana, and E. L. Neves, “Aspects of the breeding strategies of two species of Senna (K. Bauhin) P.Mill. (Caesalpiniaceae) co-occurrent in a continental sand dune ecosystem from the Medium São Francisco River, Bahia”, Sitientibus sér. Ci. Biol., vol. 2, no. 1/2, pp. 49–54, Jun. 2002.