Leeds-Lyon Symposium on Tribology,3d,1976 Leeds-Lyon Symposium on Tribology 5th:1978 Leeds-Lyon Symposium on Tribology,4th,1977 Leeds-Lyon Symposium on Tribology,2d,Lyon,1975 Leeds-Lyon Symposium on Tribology 6th:lyon,1979 Leeds-Lyon Symposium on Tribology(8th:lyon,1981) Leeds-Lyon Symposium on Tribology(12th:1985:Lyon) Internation Symposium on Radioimmunology Leeds-Lyon Symposium on Tribology(11th:Univ.of Leeds) Leeds-Lyon Symposium on Tribology(16th:1989:Lyon,France)