Affiliation: | (1) Department of Computing Goldsmiths, Goldsmiths College, University of London, Lewisham Way, London, SE14 6NW, UK;(2) Department of Computing, Centre for Research in Computing, The Open University, Walton Hall, Milton Keynes, MK7 6AA, UK;(3) Department of Computing Science, King’s College, University of Aberdeen, Meston Building, Aberdeen, AB24 3UE, Scotland, UK |