Baharuddin, M., P. R. Akbar, J. T. Sumantoyo, and H. Kuze. “Development of Circularly Polarized Synthetic Aperture Radar Sensor Mounted on Unmanned Aerial Vehicle”. Jurnal Otomasi Kontrol Dan Instrumentasi, vol. 1, no. 2, Jan. 2011, p. 59, doi:10.5614/joki.2009.1.2.1.