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Effects on rare earth oxides produced by radium-barium compounds and on the production of permanently luminous preparations by mixing the latter with powdered minerals
- "Effects on rare earth oxides produced by radium-barium compounds and on the production of permanently luminous preparations by mixing the latter with powdered minerals"
- "Effects on rare earth oxides produced by radium-barium compounds and on the production of permanently luminous preparations by mixing the latter with powdered minerals"@en