This can be the number assigned on your post via the publisher, and it is the just one you'll use to reference your short article in the library catalogues. ISSN code (also called as "ISSN framework" or "ISSN syntax") can be expressed as follows: NNNN-NNNC Indium-cost-free MgSnO3 transparent conductive oxide https://www.directivepublications.org/journal-of-applied-nanoscience/