Ponomarev, S. G., A. A. Vasin, V. P. Tarasovskiy, A. V. Smirnov, A. V. Reznichenko, and O. L. Sidortsova. “Kinetics of Grinding Precursor Powders for Piezoceramic Materials Based on Potassium and Sodium Noibate Systems”. Amazonia Investiga, vol. 7, no. 17, Dec. 2018, pp. 211-8, https://amazoniainvestiga.info/index.php/amazonia/article/view/345.