Azzolini, Marisa, et al. “Indices to Evaluate Postharvest Quality of Guavas under Different Maturation Stages”. Pesquisa Agropecuaria Brasileira, vol. 39, no. 2, Feb. 2004, pp. 139-45, doi:10.1590/S1678-3921.pab2004.v39.6748.