Archive Policy

All articles published in this magazine after 1979 have been digitally archived. The paper and electronic versions of the paper are kept on file in the editorial department. To ensure data security, all information has also been backed up in the editorial department. All other relevant materials, such as additional information and forms provided by the author when submitting the paper, are archived in the editorial department. The full text of this publication can also be downloaded from databases such as China National Knowledge Infrastructure, Wanfang, and VIP.