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"FWH." (n.d.). Fullformexpand.com. Retrieved February 21, 2026, from https://www.fullformexpand.com/fwh/ffowcs-williams-and-hawkings.
FWH. (2026). Fullformexpand.com. Available at: https://www.fullformexpand.com/fwh/ffowcs-williams-and-hawkings (Accessed: 21 February 2026).