A lot of papers from conferences and articles from journals get thrown up onto the internet, hidden away under the piles of trash. Sometimes people put things up as a form of storage so they don't link from their website to it and it sits on a server as a back-up, Academics are notoriously unorganised so the tech savvy ones know this is a good way to keep things safe. GOOGLE BOTS AND SPIDERS FIND EVERYTHING, and a lot of people don't realise that even if it's not linked to it's still there to find, it just takes the bots longer, that's their job, to trawl the internet finding stuff. Most of this stuff gets .pdf'd to try and cut down on size and to try and stop people copying it (which doesn't work unless your really clever about it)
OK... so without further ado how to use advanced search in Google to get good results...
Instead of just using the normal Google search bar and button on http://www.google.co.uk/ click on advanced search
Anyway, enter you search words and in the "file format" drop down box, pick "Adobe Acrobat PDF" and click the advanced search button

You can skip all that though and streamline your search by typing "filetype:pdf" after your search in the normal Google search bar or website. If I’m trawling through looking for lots of different stuff I’ll just cut and paste that bit, keep it on my clipboard and just paste it after each search.
Hope this is helpful and it should improve your research skills and what sort of work your referencing.
Maybe we can start sharing links through the blog that you have found using your newly learned skills...