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How to mark the same reference twice in a paper?
If the same reference is cited many times, the way to add comments is the same. According to the definition of GB/T 77 14-20 15, the reference after the text refers to the relevant literature information resources cited for writing or editing papers and works.

According to the requirements of China Academic Journals (CD-ROM Edition) Retrieval and Evaluation Data Standard (Trial) and China Social Science Journals Arrangement Standard (Revised Edition), many publications distinguish between references and annotations, and define annotations as "words that further explain or supplement a certain content in a text", which are listed at the end of the article, separated from references or placed at the footer.

Extended data

Document annotation

1, monographs, papers, dissertations and reports

[serial number] Principal. Title of the document [Document Type ID]. Place of publication: publisher, year of publication. Starting and ending page numbers (optional)

Liu Guojun, Chen Shaoye. Library catalogue [M]. Beijing: Higher Education Press,1957.15-18.

2. Journal articles

【 Serial number 】 Principal responsible person. File title [J]. Publication name, year, volume (issue): page numbers.

[1] He Lingxiu. Read the history of Nanming [J]. Study on the History of China, 1998, (3): 167- 173.

Ou Jianping, Song Tietao, et al. New progress in application research of passive energy dissipation system [J]. Earth Gaga Project,1997,38 (3): 358-361.

3. The precipitation documents in the paper set.

【 Serial number 】 The principal responsible person of the precipitation document. Title of precipitation document [A]. Principal of the original voucher (optional). Title of original file [C]. Place of publication: publisher, year of publication. Start and end page numbers.

Zhong wenfa The Application of Nonlinear Programming in the Distribution of Combustible Poisons [A]. Zhao Wei. Theory and Application of Operations Research-Proceedings of the Fifth Congress of China Logistics Society [C].Xi 'an: xidian university Publishing House, 1996. 58666.86866868666

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