W.G.Gray, (Princeton)International Conference on Finite Elements in Water Resources International Conference on Finite Elements in Water Resources C.A.Brebbia, (London)International Conference on Finite Elements in Water Resources (Broghton)International Conference on New Developments in Automatic Testing International Conference on Finite Elements in Flow Problems,2d (Bangkok)International Conference on Water Resources Engineering International Conference on New Developments in Automatic Testing 10th international conference on phenomena in ionized gases 1971 5th international conference on HF radio systems and techiques