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TESTS OF BORN APPROXIMATIONS - DIFFERENTIAL AND TOTAL 23S 21P AND 21S CROSS SECTIONS FOR EXCITATION OF HE BY 100- TO 400-EV ELECTRONS
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OSCILLATOR STRENGTHS FOR HELIUM ISOELECTRONIC SEQUENCE
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JOURNAL OF RESEARCH OF THE NATIONAL BUREAU OF STANDARDS SECTION A-PHYSICS AND CHEMISTRY,
1967, A 71 (02)
:163-+