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Reference type and its identification:

Monograph M Collection C Newspaper Articles N Periodical Articles J Paper D Report R Standard S Patent P

References are listed at the end of the article in the order in which they appear in the text; The table is marked with "reference:" (upper left box) or "[reference]" (center); The serial numbers of references are displayed in the upper left box, and the numbers are represented by square brackets, such as [1], [2], [etc., so as to be consistent with the format of serial numbers in the text. Each reference entry ends with ".".