How can I get a paper if our library is not subscribed to the journal? I am a PhD student writing my thesis, and desperately need some specific papers which are not accessible via our library subscription. I contacted the authors to get a copy from them but some didn't reply. There were not available in free repositories and buying the articles from the publisher is too expensive for me.

Is there any possibility for getting a few papers you need?
My university has an inter library loan system where I've been able to submit requests for copies of an article. It requires entering citation information about the article and I have seen requests returned in a week or so. Sometimes the requests are digital, sometimes they are physical.