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 Results for DC.creator="T." AND DC.creator="Janssen" 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 ]
... to the a, b and c axes, and internal coordinate t, the generators of the (3 + 1)-dimensional superspace group Pcmn ... group are, respectively: for m, n, r, s integers and t real. These conditions are never satisfied simultaneously. It depends on ... 1 it also depends on the value of the `phase' t, or more precisely on the product [tau] = 4st. The ...

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 ]
... is the three-dimensional intersection, one associates with a translation t in the internal space three-dimensional independent shifts, one for ... 9.8.5.2) and (9.8.5.4), and Note that one has , for any t from as is a linear operator. Because of the linearity ... the composite structure is the intersection with the ordinary space (t = 0) of a pattern having atomic position vectors given ...

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 ]
... is the three-dimensional intersection, one associates with a translation t in the internal space three-dimensional independent shifts, one for ... 9.8.5.2) and (9.8.5.4), and Note that one has , for any t from as is a linear operator. Because of the linearity ... the composite structure is the intersection with the ordinary space (t = 0) of a pattern having atomic position vectors given ...

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