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+====== TTP97-18 Heavy Quark Current Correlators to ${\cal O}(\alpha_s^2)$  ======
+   <hidden TTP97-18  Heavy Quark Current Correlators to ${\cal O}(\alpha_s^2)$  > In this paper the three-loop polarization functions \Pi(q^2)
+ are calculated for the cases of an external vector, axial-vector, scalar or
+ pseudo-scalar current. Results are presented for the
+ imaginary part which directly leads to the cross section
+ $\sigma(e^+e^- \to Z \to hadrons)$ and to the Higgs
+ decay rates, respectively.
+ </hidden>
+|**K.G. Chetyrkin, J.H. Kuehn, M. Steinhauser**  |
+|** Nucl. Phys. B505 40-64 1997  **  |
+| {{preprints:1997:ttp97-18.pdf|PDF}} {{preprints:1997:ttp97-18.ps|PostScript}} [[http://arxiv.org/abs/hep-ph/9705254|arXiv]]   |
+| |