My usual go-to is to use Sci-Hub but that database hasn't been updated in a long time so I've switched over to Nexus Search. Chrome and Firefox extension here:

My usual go-to is to use Sci-Hub but that database hasn't been updated in a long time so I've switched over to Nexus Search. Chrome and Firefox extension here: https://github.com/aokellermann/nexus-now https://github.com/aokellermann/nexus-now