Institution: | Institute of Computer Science, Polish Academy of Sciences, Ordona 21, 01-237 Warsaw, Poland A1 Department of Philosophy, University of Victoria, Victoria, B.C., Canada V8W 3P4 A2 Institute of Telecommunications, Szachowa 1, 04-894 Warsaw, Poland e-mail: beatak@ipipan.waw.pl e-mail: morgan@uvphys.phys.uvic.ca e-mail: orlowska@itl.waw.pl |