Laperuta, L. D. C. (2009) “New genes conferring resistance to Asian soybean rust: allelic testing for the Rpp2 and Rpp4 loci”, Pesquisa Agropecuaria Brasileira, 43(12), pp. 1741–1747. doi: 10.1590/S1678-3921.pab2008.v43.1129.