Sci retrieval certificate needs to be issued by domestic authorities. You can open two places, the local medical information office and the scientific and technological information office. Yusuke reminds: hospital staff need to go to the medical information office to issue it. If it is a school class, you need to go to the science and technology information office.

Please note: sci can only be retrieved if it is included in pubmed, and pubmed will only be included after it has been included in official website for a period of time. Every search costs money, so make sure when you search.