Fullformexpand.com, 2026. "DIFAR." Accessed April 6, 2026. https://www.fullformexpand.com/difar/directional-frequency-analysis-and-recording.
"DIFAR." (n.d.). Fullformexpand.com. Retrieved April 6, 2026, from https://www.fullformexpand.com/difar/directional-frequency-analysis-and-recording.
DIFAR. (2026). Fullformexpand.com. Available at: https://www.fullformexpand.com/difar/directional-frequency-analysis-and-recording (Accessed: 6 April 2026).