Ramli, R., A. Hartono, E. Sanjaya, A. Aminudin, K. Khairurrijal, F. Haryanto, C. Imawan, and M. Djamal. “A Novel Ternary CoFe2O4/CuO/CoFe2O4 As a Giant Magnetoresistance Sensor”. Journal of Mathematical and Fundamental Sciences, vol. 48, no. 3, Dec. 2016, pp. 230-4, doi:10.5614/j.math.fund.sci.2016.48.3.4.