Fernandes, Pedro Dantas, et al. “ Mineral Nutrition of Ornamental Plants: V. Studies on Nitrogenous Fertilization of Gladiolus Grandiflorus L., Cv. ’Perusi’ ”. Anais Da Escola Superior De Agricultura Luiz De Queiroz, vol. 31, Jan. 1974, pp. 621-34, https://doi.org/10.1590/S0071-12761974000100048.