França, A.F., et al. “ Effect of Calcium on Dry Matter Production and Mineral Composition of Millets Plant (Pennisetum Americanum (L.) K. Schum.) ”. Anais Da Escola Superior De Agricultura Luiz De Queiroz, vol. 44, no. 2, Jan. 1987, pp. 1255-81, https://doi.org/10.1590/S0071-12761987000200018.