GroupTheory`
GroupTheory`
GTGauntCoefficient
GTGauntCoefficient[l1,m1,l2,m2,l3,m3]
calculates the integral over three spherical harmonics 
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Details and Options
- The intregaral is calculated using ThreeJSymbol
.- See: W. Hergert, M. Geilhufe, Group Theory in Solid State Physics and Photonics. Problem Solving with Mathematica, chapter 7.4.