International Symposium on Large Chemical Plants,4th,Antwerp,1979 International Symposium on Cardiac pacing International Symposium on Aeroelasticity International Symposium on Gastric Cancer International Symposium on Macromolecules International Symposium on Synergetics SID international symposium digest of technical papers International Symposium Large Chemical Plants,3d,Antwern,1976 International Symposium on Agglomeration International Symposium on Air Pollution