Comments on the paper The determination of cyclicity, hexagonality and other properties of polytypes by Dornberger-Schiff, Sebmittler & Farkas-Jahnke. Erratum

Dornberger-Schiff et al. [Acta Cryst. (1971), A27, 216] derived some relations between the Zhdanov symbol and their π(m, ρ) which is derived from the Fourier transform of the unitary intensities. It is pointed out that the same and other relations had previously been derived by the present authors. The most general forms of these relations are given.