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- [1] Remarks on the excitation and ionisation tension of helium. ZEITSCHRIFT FUR PHYSIK, 1922, 11 : 155 - 160
- [5] EXCITATION OF HELIUM IN AURORA JOURNAL OF ATMOSPHERIC AND TERRESTRIAL PHYSICS, 1961, 21 (01): : 54 - &
- [6] EXCITATION PROCESSES IN HELIUM PROCEEDINGS OF THE ROYAL SOCIETY OF LONDON SERIES A-MATHEMATICAL AND PHYSICAL SCIENCES, 1960, 258 (1292): : 124 - 145