An R interface to the RESTful API from the open source article level metrics
software Lagotto, created by the Public Library of Science (PLOS). A number of
publishers are using Lagotto, so you can drop in a different base URL to the
functions in this package to get to not only PLOS data, but
data for Crossref, and more.Authenication was required, but has now been removed going foward in Lagotto.
You only need API keys for a few of the data providers that are running old
versions of Lagotto, and that will change as they upgrade their Lagotto sofware.