Research paper RP1787-RP1788, RP1791-RP1795, RP1797, RP1799-RP1800, RP 1803, RP1805-RP1806. RP 1799. Mass-spectrometer study of rare gases [with list of references]; by Vernon H. Dibeler, Fred L. Mohler, and Robert M. Reese.

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