K. Minami and H. P. Haag, “ Vegetable mineral nutrition: LXXXVIII. Nutrient extraction by leek (Allium porrum) ”, An. Esc. Super. Agr. Luiz de Queiroz, vol. 48, pp. 293–299, Jan. 1991, doi: 10.1590/S0071-12761991000100016.