This is actually the variety assigned in your post with the publisher, and it is the 1 you will use to reference your post within the library catalogues. ISSN code (also known as as "ISSN composition" or "ISSN syntax") is usually expressed as follows: NNNN-NNNC SJR The SJR is usually https://www.directivepublications.org/journal-of-applied-nanoscience/