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So I finally got in touch with a PI in a field I'm interested in. He sent me an introduction email telling me some suggested reading for some papers he wrote. I found one of them for free, but the other 2 cost money (about $60 total). Should I pay for these articles or just skip them? Again, they're mostly "suggested" reading but I'm not sure what the proper etiquette is for these types of things (I'm very inexperienced in terms of prior research experience, obviously). Thanks!