Houston R J, Wickramasinghe Y A, Rolfe P
Department of Biomedical Engineering and Medical Physics, School of Postgraduate Medicine and Biological Sciences, University of Keele, Hospital Centre, Hartshill, Stoke-on-Trent, UK.
Med Biol Eng Comput. 1994 May;32(3):355-6. doi: 10.1007/BF02512538.