 | R.I. Grigorchuk , Steklov Mathematical Institute, Moscow, Russia,
Sep. 1 - Nov. 1, 1996 |
| R.Y. Sharp , University of Sheffield, Sheffield, UK,
June 29 - July 8, 1996 |
| M. Brodmann , Institut für Mathematik, Universität Zürich, Zürich, Switzerland,
June 29 - July 8, 1996 |
| P. Schenzel , Institut für Informatik Fachbereich Mathematik und Informatik, Martin-Luther, Germany,
June 29 - July 8, 1996 |
| M.M. Arslanov , Kazan State University, Kazan, Russia,
April 2 - June 6, 1996 |
|
