Energy levels and classifications of doubly-excited states in two-electron systems with nuclear charge, Z = 1, 2, 3, 4, 5, below the N = 2 and N = 3 thresholds
1977 ◽
Vol 20
(2)
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pp. 127-141
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1989 ◽
Vol 50
(C1)
◽
pp. C1-583-C1-588
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1995 ◽
Vol 28
(1)
◽
pp. 11-22
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1989 ◽
Vol 136
(7-8)
◽
pp. 423-427
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