By Adkins G.S.   Fell R.N.   Sapirstein J.   in Annals of Physics

ISSN:0003-4916|295|2|136-193

Elsevier‎(2002)‎

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By Johnson W.R.   Liu Z.W.   Sapirstein J.   in Atomic Data and Nuclear Data Tables

ISSN:0092-640X|64|2|279-300

Academic Press‎(1996)‎

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By Sapirstein J   Cheng K T   in Canadian Journal of Physics

ISSN:1208-6045|86|1|25-31

NRC Research Press‎(2008)‎

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By Cheng K T   Chen M H   Johnson W R   Sapirstein J   in Canadian Journal of Physics

ISSN:1208-6045|86|1|33-43

NRC Research Press‎(2008)‎

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