This is the amount assigned to the write-up by the publisher, and it's the one particular you'll use to reference your report inside the library catalogues. ISSN code (also referred to as as "ISSN framework" or "ISSN syntax") may be expressed as follows: NNNN-NNNC For that latter, the formation of https://www.directivepublications.org/journal-of-applied-nanoscience/