Requirements for application of Natural Science Foundation: Introduction, including topics, arguments, arguments and references, not counting words. But once you get into the topic, the quoted part should be calculated in words. It is best to refine this part and highlight the theme.

The purpose of listing references after academic papers: 1. In order to reflect the real scientific basis; 2. In order to show respect for the scientific achievements of predecessors, the source of the cited materials should also be indicated for easy retrieval; 3. In order to show a serious scientific attitude, distinguish your own views or achievements from others'.