DOI is now associated for each paper in IJPTE.

Editor of the IJPTE is proudly announcing that a specific DOI number will be associated with each paper published in the journal. A digital object identifier (DOI) is a unique alphanumeric string assigned by a registration agency (the International DOI Foundation) to identify content and provide a persistent link to its location on the Internet. The publisher assigns a DOI when an article is published and made available electronically. More information about DOI could be found here.