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J.M. Ngoko Djiokap, N.L. Manakov, A.V. Meremianin, and A.F. Starace, “Carrier-Envelope-Phase-Induced Asymmetries in Double Photoionization of He by an Intense Few-Cycle XUV Pulse,” Phys. Rev. A 88, 053411 (2013).
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J.M. Ngoko Djiokap, S.X. Hu, W.-C. Jiang, L.-Y. Peng, and A.F. Starace, “Asymmetries in Production of He+(n=2) with an Intense Few-Cycle Attosecond Pulse,” Phys. Rev. A 88, 011401(R) (2013).