International Conference on the Production Application of Clean steols. International Conference on the Theory and Applications of Graphs International Conference on the Physics of Semiconductors International Conference on Production Technology International conference on the applications of the Morsbauer effect International Conference on the Design and Application of EHV Substations,London,1977 International Conference on The Application of Standards for Open Systems International Conference on the Occurrence Propeties and Utilization of Neolites International Conference on the Theory and Applicatios of Graphs,4th,Kalamazoo,1980 International Conference on the Physics of Semicorductors