If the paper belongs to people you know, such as people from the same research group, or colleagues in private contact, you can publicly point out the mistakes and the basis of your judgment with the author on the phone or through WeChat. If you are an author with a correct attitude towards scientific research, you should accept your opinions with an open mind. Even if the same paper is not necessarily revised, it should be revised in the subsequent published papers.

Secondly, if you are just colleagues, don't know each other, and just want to point out his mistakes with each other, you can send an email to each other through the mailing address attached to the paper. If the paper itself does not provide contact information, you can also ask the publishing agency for the contact information of the author, and the publishing agency should have it.

Finally, the most formal way is to contribute to the same publishing institution in the form of a paper or write a letter to refute another paper. Like the Han Chunyu incident a while ago, it was later because many scholars published papers and obtained diametrically opposite results through follow-up experiments, which triggered doubts about Korean achievements.