Hi Doug > >I must have missed this reference myself - does anyone know it? > > More to the point; if you read it would you believe it? That depends on the paper! I'll follow the thread ;-) -- Bradley Cheek - [log in to unmask] (Well Close Square) http://www.wcsquare.demon.co.uk (but no sore throat protocol yet) Connecting via Demon Internet Ltd %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%