Schuch, Dulce Maria Tocchetto, et al. “Detection of <i>Paenibacillus larvae< i> Subsp. <i>larvae< i> Spores in Brazil”. Pesquisa Agropecuaria Brasileira, vol. 38, no. 3, Mar. 2003, pp. 441-4, doi:10.1590/S1678-3921.pab2003.v38.6590.