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THE APPLICATION OF VARIATIONAL METHODS TO SCATTERING BY IONS .1. THE ELASTIC SCATTERING OF ELECTRONS BY HELIUM IONS
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An attempt to observe the spectrum of doubly excited helium
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A second-order calculation of HeI 2s2p (1), (3) P
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PHYSICAL REVIEW,
1934, 46 (05)
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Extreme ultraviolet spectra excited by controlled electron impacts
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JOURNAL OF THE FRANKLIN INSTITUTE,
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REMARKS ON THE VARIATIONAL METHOD FOR SCATTERING PROBLEMS
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1950, 79 (03)
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HULTHEN L, 1944, K FYSIOGR SALLSK LUN, V14