Name: Yan-Qing Ma (email_not_shown)
Date: 01/08/09-08:05:25 AM Z

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Instead of using GSD, maybe DiracGamma works.

e.g.
DiracGamma[Momentum[a]]/.Momentum[a]:>s1*Momentum[p]+s2*Momentum[q]

You can change them to dimension D if you like.
Good luck!

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