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Fullformexpand.com, 2025. "ETK." Accessed December 2, 2025. https://www.fullformexpand.com/etk/207509.
"ETK." (n.d.). Fullformexpand.com. Retrieved December 2, 2025, from https://www.fullformexpand.com/etk/207509.
ETK. (2025). Fullformexpand.com. Available at: https://www.fullformexpand.com/etk/207509 (Accessed: 2 December 2025).