This is the variety assigned towards your post through the publisher, and it's the a person you are going to use to reference your write-up within the library catalogues. ISSN code (also known as as "ISSN construction" or "ISSN syntax") is often expressed as follows: NNNN-NNNC SJR The SJR is https://www.directivepublications.org/journal-of-applied-nanoscience/