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"ECEF." Fullformexpand.com, https://www.fullformexpand.com/ecef/363961. Accessed 21 Nov. 2025.
Fullformexpand.com, 2025. "ECEF." Accessed November 21, 2025. https://www.fullformexpand.com/ecef/363961.
"ECEF." (n.d.). Fullformexpand.com. Retrieved November 21, 2025, from https://www.fullformexpand.com/ecef/363961.
ECEF. (2025). Fullformexpand.com. Available at: https://www.fullformexpand.com/ecef/363961 (Accessed: 21 November 2025).