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 Results for DC.creator="A." AND DC.creator="Janner" in section 9.8.5 of volume C
The incommensurate versus the commensurate case
Janssen, T., Janner, A., Looijenga-Vos, A. and Wolff, P. M. de  International Tables for Crystallography (2006). Vol. C, Section 9.8.5.2, pp. 942-943 [ doi:10.1107/97809553602060000624 ]
... use the description as developed for incommensurate crystal phases for a (commensurate) superstructure. In fact, very often the modulation wavevector also ... incommensurate) values, several rational values at various phase transitions of a given crystal or in different compounds of a given structural family. In these cases, there is three- ...

Incommensurate composite crystal structures
Janssen, T., Janner, A., Looijenga-Vos, A. and Wolff, P. M. de  International Tables for Crystallography (2006). Vol. C, Section 9.8.5.1, pp. 941-942 [ doi:10.1107/97809553602060000624 ]
... structures 9.8.5.1. Incommensurate composite crystal structures The basic structure of a modulated crystal does not always have space-group symmetry. Consider ... Disregarding modulations, one can describe these crystals as composed of a finite number of subsystems, each with its own space-group ... mutually incommensurate. In that case, the overall symmetry is not a space group, the composite crystal is incommensurate and so ...

Generalizations
Janssen, T., Janner, A., Looijenga-Vos, A. and Wolff, P. M. de  International Tables for Crystallography (2006). Vol. C, Section 9.8.5, pp. 941-943 [ doi:10.1107/97809553602060000624 ]
... Generalizations 9.8.5.1. Incommensurate composite crystal structures | | The basic structure of a modulated crystal does not always have space-group symmetry. Consider ... Disregarding modulations, one can describe these crystals as composed of a finite number of subsystems, each with its own space-group ... mutually incommensurate. In that case, the overall symmetry is not a space group, the composite crystal is incommensurate and so ...

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