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"FOCQ." Fullformexpand.com, https://www.fullformexpand.com/focq/first-order-constraint-qualification. Accessed 19 Feb. 2026.
Fullformexpand.com, 2026. "FOCQ." Accessed February 19, 2026. https://www.fullformexpand.com/focq/first-order-constraint-qualification.
"FOCQ." (n.d.). Fullformexpand.com. Retrieved February 19, 2026, from https://www.fullformexpand.com/focq/first-order-constraint-qualification.
FOCQ. (2026). Fullformexpand.com. Available at: https://www.fullformexpand.com/focq/first-order-constraint-qualification (Accessed: 19 February 2026).