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P. D. Porta
[1] J. Morrison,et al. Barium Getters in Carbon Monoxide , 1955 .
[2] P. D. Porta. Performance characteristics of barium getters with particular reference to their application in thermionic valves , 1954 .
[3] S. Wagener. The use of getters for the production of very high vacua , 1953 .