IEEE International Symposium on Electrical network theory IEEE International Symposium on Electrical Insulation(1990:Toronto,Canada) International Symposium on River Sedimentation 1st International symposium on ramie prifession International Symposium on Air Pollution IEEE International Symposium on Electrical Insulation(1986:Washington,D.C.) IEEE International Symposium on Electrical Insulation,4th,Philadelphia,1982 International Symposium on Agglomeration International Symposium on Gastric Cancer International Symposium on Neurosecretion