The specific steps are as follows:

1. Find the original web page where the paper was published, which can be found through DOI.

2. Click Getrightsandcontent to enter the copyright page, which requires registration and is free.

3. Fill in the required information as required. The server is foreign and may be slow. Wait patiently, and then submit to ensure that the quotation is 0.

4. Just accept the offer.

To download sci papers, first go to SCI website, then open the paper download website, and finally download PDF format.