The conference papers retrieved by EI are not core journal papers, because conference papers and journal papers are two categories of academic papers, and it is impossible to transform one into the other. But some periodical papers retrieved by EI belong to EI core edition, because EI database is actually composed of JA and CA, in which JA is EI periodical papers and CA is EI conference papers. If you still don't understand what I said, I suggest you go to Baidu for a search: EI Academic Conference Center, which specifically explains a lot of EI conference information and learning materials in detail.