Calculations of long-range three-body interactions for He(${n}_{0}^{λ}S$)-He(${n}_{0}^{λ}S$)-He(${n}_{0}^{′λ}L$) - Pei-Gen Yan, Li-Yan Tang, Zong-Chao Yan, and James F. Babb (American Physical Society (APS), 2018)
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Keywords: U