I recommend Matveev, Mayer, Roesch, ``Efficient symmetry treatment for the nonrelativistic and relativistic molecular Kohn-Sham problem.'', Comp. Phys. Comm 160 91 (2004), http://dx.doi.org/10.1016/j.cpc.2004.02.013 [Broken] . They give a general, yet concise and very elegant approach to evaluating matrix representations and irreducible representations of arbitrary point groups.
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Thanks for the posts.
Theese are actually what I need.