| Institution: | 1. Department of Mathematics and Computer Science, 67 York Street, Sackville, NB, Canada E4L 1E6;2. Department of Mathematics, Wilfrid Laurier University, Waterloo, Ont., Canada N2L 3C5;3. Department of Mathematics and Statistics, York University, N520 Ross Building, 4700 Keele Street, Toronto, Ont., Canada M3J 1P3;4. Computer and Automation Institute of the Hungarian Academy of Sciences, H-1111, Budapest, Lágymányosi u. 11, Hungary;5. Department of Computer Science, Eötvös University, Budapest, H-1117 Budapest, Pázmány P. sétány 1/C, Hungary;1. UK;2. UK;3. UK;4. UK;5. UK;6. UK |
