C. R. Johnson, Department of Mathematics, College of William and Mary, U.S.A., January, 14-24

Jonathan Vaughan, Dep. of Psychology and Neuroscience, Hamilton College NY, U.S.A., October, 9-12

J. S. B. Gajjar, School of Mathematics, University of Manchester, Reino Unido, January (one week)

Juan Viaño Rey, Universidade de Santiago Compostela, Espanha, March 21 – May 14