Manica, Ivo, et al. “Six Plant Spacings and Yield of the Yellow Passion Fruit (<i>Passiflora edulis< i> F. <i>flavicarpa< I> Deg.) in Porto Lucena, RS, Brazil”. Pesquisa Agropecuaria Brasileira, vol. 29, no. 7, July 1994, pp. 1083-90, doi:10.1590/S1678-3921.pab1994.v29.4151.