“…What is perhaps worse, the main result in [5] has been used to obtain further results by some other researchers (see for example [2,6]). In this note, we will give a counterexample and provide a correct proof.…”
“…What is perhaps worse, the main result in [5] has been used to obtain further results by some other researchers (see for example [2,6]). In this note, we will give a counterexample and provide a correct proof.…”
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