V. M. Rapchan and E. Malavolta, “ Studies on the mineral nutrition and fertilization of the passion fruit plant (Passiflora edulis F. flavicarpa): II. placement of fertilizer phosphorus ”, An. Esc. Super. Agr. Luiz de Queiroz, vol. 33, pp. 455–458, Jan. 1976, doi: 10.1590/S0071-12761976000100041.