Acta Cryst. (2002). A58, 79 [ doi:10.1107/S0108767301018372 ]
Abstract: Owing to a copying error, the formula in §2.1(iv) of the paper by Authier & Malgrange [Acta Cryst. (1998), A54, 806-819] is erroneous and should be replaced by:
Keywords: diffraction physics; dynamical diffraction.
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