Cunha, R.J.P. and Haag, H.P. (1980) “ Mineral nutrition of papaya tree (Carica papaya L.): II - boron deficiency under field and greenhouse conditions ”, Anais da Escola Superior de Agricultura Luiz de Queiroz, 37(1), pp. 291–302. doi:10.1590/S0071-12761980000100017.