A DOI, or Digital Object Identifier, is a string of numbers, letters and symbols used to permanently identify an article or document and link to it on the web. A DOI will help your reader easily locate a document from your citation.
You can find more details at Wikipedia: https://en.wikipedia.org/wiki/Digital_object_identifier
IJSRP provide DOI to all published papers. After publication it can take 24-48 hours for activation of DOI number. We have started providing DOI number from March 2018 Edition.
IJSRP Publisher Id is: 10.29322
You can resolve DOI for your paper at https://www.doi.org/