Papers included in 1 and SCI can be distributed in larger university libraries, such as Tongji, Tsinghua and Peking University. At that time, the author only needs to provide the English title of the article he wants to retrieve, and will issue a certificate to the author after verification. Printed foreign language documents are stamped with "consistent with the original" to verify the authenticity, free of charge. Sci, SSCI, EI and other services for the collection of SCI papers need to pay a certain fee to issue foreign documents. The cost is not very high, usually tens of dollars or so.

2. If the paper is completed by more than one person, the inclusion certificate of sci paper can only be applied by the first author of the paper. Other authors can use the first author's sci paper to prove it. In order to improve work efficiency, please send the first author who received the certificate of inclusion to other collaborators in time so that they can enjoy it!

3. University libraries can issue sci papers collection certificates and SSCI, EI and other collection services. The difference is that the author can directly search the EI database on the library homepage, save the results, and then provide them to the library information consulting department, and issue a certificate after verification (the EI inclusion certificate issued by the information consulting department is free).