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Dmytro Bykov ◽  
Dmitry Liakh ◽  
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Perturbation Theory ◽  
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Janus J. Eriksen ◽  
Devin A. Matthews ◽  
Jeppe Olsen ◽  
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Keyword(s):  
Perturbation Theory ◽  
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Author(s):  
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Poul Jørgensen ◽  
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Keyword(s):  
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