Pasqual, M. and Lopes, P.A. 1991. Influence of some factors on rooting of pear rootstock <i>in vitro</i>. Pesquisa Agropecuaria Brasileira. 26, 3 (Mar. 1991), 331–334. DOI:https://doi.org/10.1590/S1678-3921.pab1991.v26.3347.