Widada, Wahyu. “METODE KALIBRASI RADAR TRANSPONDER ROKET MENGGUNAKAN DATA GPS (CALIBRATION METHOD OF RADAR TRANSPONDER FOR ROCKET USING GPS DATA)”. Indonesian Journal of Aerospace, vol. 10, no. 1 Juni, Dec. 2012, pp. 57-62, https://ejournal.brin.go.id/ijoa/article/view/12359.