DOI-OA-Crawler/README.md at master · atmire/DOI-OA-Crawler · GitHub

"Wiley article page urls can be extended with /epdf. From these EPDF pages, we retrieve the value of the field "'WOL-Article-Access-State'" in the returned HTML source. Currently, this approach only works for articles hosted on onlinelibrary.wiley.com. However, we are very interested in developing similar approaches for other publishers/vendors...."