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"ERFEN." Fullformexpand.com, https://www.fullformexpand.com/erfen/121799. Accessed 2 Jan. 2026.
Fullformexpand.com, 2026. "ERFEN." Accessed January 2, 2026. https://www.fullformexpand.com/erfen/121799.
"ERFEN." (n.d.). Fullformexpand.com. Retrieved January 2, 2026, from https://www.fullformexpand.com/erfen/121799.
ERFEN. (2026). Fullformexpand.com. Available at: https://www.fullformexpand.com/erfen/121799 (Accessed: 2 January 2026).