J. M. da Silva Júnior, M. Rodrigues, E. M. de Castro, S. K. V. Bertolucci, e M. Pasqual, “<b>Changes in anatomy and chlorophyll synthesis in orchids propagated <i>in vitro</i> in the presence of urea</b&gt; - doi: 10.4025/actasciagron.v35i1.15356”, Acta Sci. Agron., vol. 35, nº 1, p. 65-72, ago. 2012.