This can be the number assigned to your short article by the publisher, and it's the one you might use to reference your report in the library catalogues. ISSN code (also called as "ISSN construction" or "ISSN syntax") is often expressed as follows: NNNN-NNNC SJR The SJR is actually a https://www.directivepublications.org/journal-of-applied-nanoscience/