General discussion מאת Howie, A, Buffat, P, Masson, A, Thomas, J, Bernholc, J, Joyner, R, Gallezot, P, Rao, C, Creighton, J, Johnson, B, Hofmeister, H, Harris, P, Bradley, J, Kuroda, H, Zamaraev, K, Couves, J, Greenslade, D, Edwards, P, Mulvaney, P, Stace, A, Mile, B, Leadbetter, A, Duncan, M, Landsman, D, Henglein, A