Manica, I. et al. (1994) “Six plant spacings and yield of the yellow passion fruit (Passiflora edulis f. flavicarpa Deg.) in Porto Lucena, RS, Brazil”, Pesquisa Agropecuaria Brasileira, 29(7), pp. 1083–1090. doi:10.1590/S1678-3921.pab1994.v29.4151.