Periodical: if a periodical has several issues in a volume every year, and the papers published in several issues have no specific theme and have no influence on each other, it is called periodical;

Special issue: it can be divided into two situations, one is a special issue that occupies the layout of the main issue, and the other is a special issue outside the normal issue. Evaluate and approve the retrieval of regular and special periodicals by extended information research institutions;

Different units have different indicators for evaluating scientific research achievements and different opinions. It is suggested that the author study the relevant evaluation documents of the unit and determine the submission requirements after confirmation.

Case:

Regarding the publication form of periodicals, different publishers and different periodicals may be different. Some periodicals only publish volumes, and there is no issue, and some volumes are linked year by year. The situation of different journals is different. It is suggested that the author study the journals before deciding to contribute.