http://publicationslist.org/drpremrajpushpakaran
https://pubpeer.com/publications/14604301
http://pubget.com/paper/14604301
http://pubget.com/paper/15143152
http://www.pubfacts.com/author/Pushpakaran+Premraj/Premraj-Pushpakaran.html
http://phdtree.org/scholar/pushpakaran-prem-raj/
https://www.collectiveip.com/people?name=Premraj%20Pushpakaran
http://scholar.google.co.in/citations?user=Ur9mg_AAAAAJ&hl=en
https://www.worldcat.org/profiles/profpremrajpushpakaran/lists/3442645
http://www.scopus.com/authid/detail.url?authorId=6507936417
http://vidwan.inflibnet.ac.in/drpremrajpushpakaran-43946.html