Academics, having written their peer reviewed articles, may at some stage in the make their work Open Access (OA). They can do this by self-archiving an electronic version of their article to a personal or departmental web page or to an institutional or subject repository, such that the article then becomes freely available to anyone with Internet access to read and cite. Those authors who do not wish to do this may leave their article solely in the hands of a toll access (TA) journal publisher who charges for access, consigning their article to remain behind a subscription barrier. Lawrence (2003), in a short study, noted that conference articles in computer science that were freely available on the World Wide Web were more highly cited that those that were not. Following this, there have been a number of studies which have tried to establish whether peer-reviewed articles from a range of disciplines which are freely available on the World Wide Web, and hence are OA, accrue more cita...