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"ERK." Fullformexpand.com, https://www.fullformexpand.com/erk/823740. Accessed 16 Feb. 2026.
Fullformexpand.com, 2026. "ERK." Accessed February 16, 2026. https://www.fullformexpand.com/erk/823740.
"ERK." (n.d.). Fullformexpand.com. Retrieved February 16, 2026, from https://www.fullformexpand.com/erk/823740.
ERK. (2026). Fullformexpand.com. Available at: https://www.fullformexpand.com/erk/823740 (Accessed: 16 February 2026).