Papers is a reference management software for Mac OS X and Windows, used to manage bibliographies and references when writing essays and articles. It is primarily used to organize references and maintain a library of PDF documents and also provides a uniform interface for document repository searches, metadata editing, full-screen reading and a variety of ways to import and export documents. Papers was developed by Alexander Griekspoor and Tom Groothuis while studying towards their Ph.D.s at the Netherlands Cancer Institute. Faced with working with hundreds of digital publications in PDF format, the pair worked on Papers to provide an iTunes-like approach to document management.