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        Journal: Symmetry, 2021
        Volume: 13 
                	Number: 1246 
                
        
        Article:
        Atomic Structure Calculations of Helium with Correlated Exponential Functions 
        Authors: 
       	by
                    Vladimir A. Yerokhin, Vojtěch Patkóš and Krzysztof Pachucki        
        Link:
        https://www.mdpi.com/2073-8994/13/7/1246
        
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