Santos, F.E.V., Caldeira, M.V.W. and Kunz, S.H. 2014. Quality of seedlings of <em>Parapiptadenia rigida</em> (Benth.) Brenan produced in different substrates with sewage sludge and rice hulls. Revista Ecologia e Nutrição Florestal - ENFLO. 1, 2 (Jul. 2014), 55–62.