The serial numbers of periodical articles are easy to find. If an article has been published in a journal, the serial number is usually on the next line of Chinese keywords.

From top to bottom, the front page of the paper is the first line of the title of the paper, the second line of the author and the author unit, the third line of the Chinese abstract and the fourth line of the Chinese keywords, followed by the Chinese library classification number, the document identification number and the article number.