Gunanto, Y. E., M. . Manawan, M. P. . Izaak, H. . Sitompul, Y. Yunasfi, and W. A. . Adi. “Structural and Magnetic Properties of Barium-Strontium-Hexaferrite Material Ba0.6Sr0.4Fe10-xCoxMnTiO19 (x = 0.5; 1.0; And 1.5) As Microwave Absorbers”. Journal of Mathematical and Fundamental Sciences, vol. 55, no. 3, May 2024, pp. 208-21, doi:10.5614/j.math.fund.sci.2024.55.3.1.