Augustin, Eliane, Bonifacio H. Nakasu, and Carlos Alberto Ely Machado. 1993. “Isoperoxidase Variability in Pear Rootstocks (Pyrus Calleryana Dcne and P. Betulaefolia Bunge)”. Pesquisa Agropecuaria Brasileira 28 (3): 329-31. https://doi.org/10.1590/S1678-3921.pab1993.v28.3882.