struggling to find full texts


Hey, I wonder if anyone could help. I’m trying to do a systematic review and have got to screen hundreds of full text articles. Scihub is being super helpful in accessing the full texts i can find, if theres a DOI. But I’d say more than half of the abstracts I’ve found don’t have a DOI or a full text i can find.

Here’s a few examples:

[https://pubmed.ncbi.nlm.nih.gov/7383585/](https://pubmed.ncbi.nlm.nih.gov/7383585/)

[http://ovidsp.ovid.com/ovidweb.cgi?T=JS&PAGE=reference&D=emed3&NEWS=N&AN=18075813](http://ovidsp.ovid.com/ovidweb.cgi?T=JS&PAGE=reference&D=emed3&NEWS=N&AN=18075813)

[http://ovidsp.ovid.com/ovidweb.cgi?T=JS&PAGE=reference&D=emed5&NEWS=N&AN=27076140](http://ovidsp.ovid.com/ovidweb.cgi?T=JS&PAGE=reference&D=emed5&NEWS=N&AN=27076140)

Anyone have any ideas? I’d rather not exclude so many papers if I can help it. I’m fairly new to this so I’m hopeful there’s some easy remedy that I haven’t come across yet.

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*edit: most of the papers I struggle to find are slightly older i.e. before 2000s