A collection of studies that have investigated the potential Open Access citation advantage. The majority, to date, have concluded that there is a significant citation advantage for Open Access articles. Much of the data here is sourced from The Open Access Citation Advantage Service, SPARC Europe (accessed August 2017)
Publish or Perish is a software program that retrieves and analyzes academic citations. It uses a variety of data sources (incl. Google Scholar and Microsoft Academic Search) to obtain the raw citations, then analyzes these and presents the following metrics:
OpenRefine (formerly Google Refine) is a powerful tool for working with messy data: cleaning it; transforming it from one format into another; and extending it with web services and external data.
An API service using a number of different data sources to find open versions of articles (or in many cases, to determine that the articles are open already):
Choose two documents (Word, PDF, PowerPoint Files). See the changes side-by-side.
Für vertrauliche Dokumente gibt es eine (kostenpflichtige) Offline-Version zum Download.