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I don't understand what this is... It doesn't scrape the full published articles/material on hidden/private URLs (unless you have access, paid for a subscription)? So what would one use this for?

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Its basically a 1-shot index of as much information as one can LEGALLY currently index.

Do you mean it just indexes the short "abstract" that's provided of each paper? Or does this even go less, and just builds an index of the URLs only.

It gets to the journals ... Perhaps you're right ... the abstracts would be plainly available as well as valuable.

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