Sinaga, H. H. ., H. B. H. . Sitorus, D. Permata, and N. Soedjarwanto. “Fractal Hilbert Sensor to Detect Partial Discharge on Transformer”. Journal of Engineering and Scientific Research, vol. 1, no. 2, Dec. 2020, pp. 94-100, doi:10.23960/jesr.v1i2.31.