Squires GL, Boothroyd AT, Horton JC, Fetters LJ, Rennie AR, Glinka CJ, Robinson RA, de Vallera AEdited by: Baumgärtner, A, Picot, CE1989Conference paper Journal:Springer Proceedings in PhysicsVolume:42, Springer-Verlag, Berlin, pp.200 - 205No abstract available