When it comes to knowledge, it's important to know where to find that paper or book you need.
There is a fantastic source for scientific publications and it is called sci-hub.
Once upon a time there was only http://sci-hub.org but then its mirrors appeared:
If http://sci-hub.org does not work try its mirrors. And when it still does not work (aka the page does not load) try to use a Russian proxy (http://www.proxynova.com/proxy-server-list/country-ru/)
There are other alternatives to sci-hub.xxx and here they are: