JPIO
n°2
05/2000
This Special Issue has been brought about by a friendly encounter which took place in Zurich in 1975 between J. Theilade, E. Helminen-Pakkala, J. Lindhe, T. MacPhee, T. Marthaler, H. Renggli, J.-P. Bernimoulin, B. Lüscher and myself (representing P. Dargent), together with H. Mühlemann, founder of the...