Evaluation of two-photon exchange graphs for the helium isoelectronic sequence

1989 ◽  
Author(s):  
J. Sapirstein
1973 ◽  
Vol 30 (8) ◽  
pp. 345-348 ◽  
Author(s):  
J. Gunion ◽  
Leo Stodolsky

1980 ◽  
Vol 22 (5) ◽  
pp. 1082-1086 ◽  
Author(s):  
J. Bernabéu ◽  
J. A. Peñarrocha

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