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"GFK." Fullformexpand.com, https://www.fullformexpand.com/gfk/36728. Accessed 12 Jan. 2026.
Fullformexpand.com, 2026. "GFK." Accessed January 12, 2026. https://www.fullformexpand.com/gfk/36728.
"GFK." (n.d.). Fullformexpand.com. Retrieved January 12, 2026, from https://www.fullformexpand.com/gfk/36728.
GFK. (2026). Fullformexpand.com. Available at: https://www.fullformexpand.com/gfk/36728 (Accessed: 12 January 2026).