Pasqual, M. and Lopes, P.A. 1991. Effects of indolebutyric acid concentration and time of incubation on rooting and growth of <i>Pyrus calleryana</i> L. Shoots obtained <i>in vitro</i>. Pesquisa Agropecuaria Brasileira. 26, 7 (Jul. 1991), 975–980. DOI:https://doi.org/10.1590/S1678-3921.pab1991.v26.3430.