I'm currently trying to systematise our use of EZproxy for non-purchased/licensed resources. There are two classes of non-purchased/licensed resources that I'm aware of. The first is the class of PURL-like: services http://doi.org/, http://purl.org/, http://handle.net/ and so forth which are used to link to purchased/licensed resources.Working out when we need to add these is pretty straight-forward: navigating from our search services to a resource fails with an authentication message and someone notices, complains and we fix things. The second class are services such as https://scholar.google.co.nz/ which, while we don't have a formal relationship with them, leverage our openurl resolver to enable users to access more content than the normally would. My question is whether any one knows of any services in the second class other than google scholar? The tricky thing here is that they're likely to work as apparently expected but not offer as much access as they might. Thoughts? Microsoft Academic Search appears not to do openurl, see https://social.microsoft.com/Forums/windows/en-US/2d1b5774-b5f0-42d8-a020- d8b89d5dadbc/microsoft-academic-search-and-openurl-compliance cheers stuart -- ...let us be heard from red core to black sky