Ponomarev, S., A. Vasin, V. Tarasovskiy, A. Smirnov, A. Reznichenko, and O. 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://www.amazoniainvestiga.info/index.php/amazonia/article/view/345.