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"BIRK." Fullformexpand.com, https://www.fullformexpand.com/birk/519296. Accessed 18 Nov. 2025.
Fullformexpand.com, 2025. "BIRK." Accessed November 18, 2025. https://www.fullformexpand.com/birk/519296.
"BIRK." (n.d.). Fullformexpand.com. Retrieved November 18, 2025, from https://www.fullformexpand.com/birk/519296.
BIRK. (2025). Fullformexpand.com. Available at: https://www.fullformexpand.com/birk/519296 (Accessed: 18 November 2025).