Synthesis of La1-xCaxMnO3 (x = 0 and 0.2) through ultrasonic mixing and its characterisationMangasi A M, Iwan Sugihartono, Teguh B P, Sitti Ahmiatri Saptari and Erfan HandokoMATEC Web Conf., 197 (2018) 02010DOI: https://doi.org/10.1051/matecconf/201819702010