International
Tables for Crystallography Volume B Reciprocal space Edited by U. Shmueli © International Union of Crystallography 2010 
International Tables for Crystallography (2010). Vol. B, ch. 1.3, p. 82

This procedure was described in Section 1.3.3.3.2.2. The main difference with the Cooley–Tukey factorization is that if , where the different factors are pairwise coprime, then the Chinese remainder theorem reindexing makes isomorphic to a direct sum.where each pprimary piece is endowed with an induced module structure by letting G operate in the usual way but with the corresponding modular arithmetic. The situation is thus more favourable than with the Cooley–Tukey method, since there is no interference between the factors (no `carry'). In the terminology of Section 1.3.4.2.2.2, G acts diagonally on this direct sum, and results of a partial transform may be transposed by orbit exchange as in Section 1.3.4.3.4.1 but without the extra terms μ or η. The analysis of the symmetry properties of partial transforms also carries over, again without the extra terms. Further simplification occurs for all pprimary pieces with p other than 2 or 3, since all nonprimitive translations (including those associated to lattice centring) disappear modulo p.
Thus the cost of the CRT reindexing is compensated by the computational savings due to the absence of twiddle factors and of other phase shifts associated with nonprimitive translations and with geometric `carries'.
Within each pprimary piece, however, higher powers of p may need to be split up by a Cooley–Tukey factorization, or carried out directly by a suitably adapted Winograd algorithm.