Perhaps you should try some spelling variations:
"ant colony optimisation algorithm" » "ant colony optimization algorithm" (Expand Search), "ante colony optimisation algorithm" (Expand Search), "anti colony optimisation algorithm" (Expand Search), "kant colony optimisation algorithm" (Expand Search)
"a colon optimisation algorithm" » "a colon optimization algorithm" (Expand Search), "a colony optimization algorithm" (Expand Search), "a wolf optimisation algorithm" (Expand Search), "a cooling optimization algorithm" (Expand Search), "de colon optimisation algorithm" (Expand Search), "a common optimisation algorithm" (Expand Search), "el colon optimisation algorithm" (Expand Search)

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