I have just had my first experience of benefiting from Elsevier's move last year to open up their back catalogue. I needed to look up a paper of Ajtai, Komlós and Szemerédi that was published in The Journal of Combinatorial Theory A in 1980 (proving a sharp upper bound for the Ramsey number R(3,k)). It was difficult to find online, but Googling was eventually enough to get the exact title, and when I Googled that I got a link to the paper on ScienceDirect. There, instead of being asked to pay, I found a link that said "pdf", and when I clicked on it, up came the paper. Nice and simple. I mention this in the interests of balance ...
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