This is actually the selection assigned towards your article with the publisher, and it's the a single you'll use to reference your posting throughout the library catalogues. ISSN code (also known as as "ISSN composition" or "ISSN syntax") may be expressed as follows: NNNN-NNNC All articles published by MDPI are https://www.directivepublications.org/journal-of-applied-nanoscience/