A precursor result to the hypergeometric construction of KZ solutions, specifically of conformal blocks for affine Lie algebra/WZW-model-2d CFTs:

- Philippe Christe, Rainald Flume,
*The four-point correlations of all primary operators of the $d = 2$ conformally invariant $SU(2)$ $\sigma$-model with Wess-Zumino term*, Nuclear Physics B**282**(1987) 466-494 $[$doi:10.1016/0550-3213(87)90693-6$]$

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