The process by which several researchers review another researcher's manuscript prior to publication to ensure research quality is referred to as

Peer review

Explanation:

Peer review is a process that has been implemented by all major scientific journal publishers in order to ensure the published research quality. Mostly, two or even three researchers review another manuscript prior to its publication in a journal. The researchers for review are selected by the editor of the journal based on the expertise of the reviewers and their past publications. Hence, peer review is the process by which several researchers review another researcher's manuscript prior to publication to ensure research quality.

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