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arXiv are always free links; and if you have an academic affiliation you can easily sign up for that. It was the first big permanent archiving and time stamping tool.

https://arxiv.org/abs/1608.01291

http://cnl.psych.cornell.edu/pubs/2016-cc-BBS.pdf

I'm thinking of adding a previous option from last week: Donald Knuth's recent SAT book. An open access preprint can be found at:

http://www.cs.utsa.edu/~wagner/knuth/

I had a previous contest where I just allowed people to pick from a big list but very few have institutional access to anything. (Though most things can now be found somewhere on the interest if one knows how to search.)

These contests will always have an open access link for anything.

Thanks,I'm not currently enrolled anywhere.

Today I have some more time, you were right, i got the whole article at the Cornell adress

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