Univ. of Western Ontario, Canada, 01/1990
Univ. of Oxford, England, 11/1994-03/1995
Univ. of Oxford, England, 24-29/3/1996
Univ. of Oxford, England, 9-14/2/1997
Univ. of Oxford, England, 5-31/5/1999
Univ. of Oxford, England, 22/1-4/2/2000
King’s College, Univ. of London, England, 15/06-15/07/2012
