TTP12-017 Adler Function, Sum Rules and Crewther Relation of Order O(alpha_s^4): the Singlet Case

TTP12-017 Adler Function, Sum Rules and Crewther Relation of Order O(alpha_s4): the Singlet Case
P. A. Baikov, K. G. Chetyrkin, J. H. Kühn and J. Rittinger
Phys. Lett. B714 62-65 2012
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