homepages/68/4076, David A. J. Pearce and David Andrew James Pearce and Dave A. J. Pearce, Home Page, https://pure.york.ac.uk/portal/en/researchers/david-andrew-james-pearce%28fb70ec4f-75ec-468d-8a4f-ffc5ef4d6c1c%29.html, The University of York, Heslington, UK