A. Use the contents of the literature published by yourself (or yourself as one of the authors) in the paper, without quoting or explaining.

B. Without any explanation, I (or I as one of the authors) extracted some contents from several published documents, spliced them into a new paper and published them again.

C the permitted second publication does not indicate the source of the first publication.

D. Reuse the data of a survey and an experiment in several papers, and don't quote or explain.

E for papers based on the same experiment or research, papers with similar methods and conclusions will be published many times after supplementing a small amount of data or information.

F the collaborators publish papers with obviously similar data, methods and conclusions on the same investigation, experiment and results.

Repeated publication refers to the act of repeatedly publishing published documents without explanation.

Repeated publication is a serious violation of academic ethics. It is often because the author is not satisfied with the journal published in the original paper that the author repeatedly publishes it. The author may think that the journal that published the original paper is too mediocre and wants to publish the paper in a more influential journal, so he revised the original paper and then resubmitted it to a higher status and more influential journal.

For example, an author once published an article in a journal published by his university, but the status of this journal in academic circles is not high, and it is only a regional journal. Later, the author submitted this paper to a foreign journal with high impact factors. The author's practice has constituted "repeated publication" and is a serious academic misconduct.