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1861, Kongelige Danske videnskabernes selskab, Oversigt over det Kongelige Danske videnskabernes selskabs forhandlinger ..., page 94:
Den er derfor skikket til i høi Grad at tiltrække sig saavel Videnskabsmændenes som det store Publicums Interesse, saameget mere som den strax i sin Fødsel tjente til Opdagelsen af tvende nye Grundstoffer (Rubidium og Caesium) og senere har sikkret et tredie Grundstof, Thalliums Existents.