Another example is the paper "Affine semigroups and Cohen-Macaulay rings" by Hoa and Trung (Trans. AMS 298, 1986) in which they give a counterexample to a result of Goto and Watanabe. Rumor has it that the counterexample was known before their paper, but in any case, they use "counterexample to the result".
Thomas Kahle
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