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2. Nunamaker and M. Neumann, presented at the 12th Scintillation and semiconductor counter Symp.
3. G. Charpak, D. Rahm and H. Steiner, CERN Preprint (Sept. 1969); submitted to Nucl. Instr. and Meth.
4. Proc. Ispra Nuclear electronics Symp.;Koester,1969