International Symposium"Gasdynamic and Chemical Lasers",Koln,1976 International Symposium Large Chemical Plants,3d,Antwern,1976 International Symposium on MINI and MiCRO Computers,Toronto,1976 International Symposium on Gas-Flow and ChemicalLasers,3d,Sept,8-12,1980,Marseille International Symposium on Assessment of Imaging Systems,London,1976 International Symposium on Large Chemical Plants,4th,Antwerp,1979 International Symposium on Foot-and-Mouth disease II,Lyon,1976. International Symposium on Detection and Prevention of Cancer,3d,New York,1976 International Symposium on MINI and MiCRO Computers,Montreal,1977 International Symposium on the Geodynamics of the South-West Pacific,Noumea,1976