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 Results for DC.creator="A." AND DC.creator="Mighell" in section 9.7.4 of volume C
Positions with the full symmetry of the geometric class
Wilson, A. J. C., Karen, V. L. and Mighell, A.  International Tables for Crystallography (2006). Vol. C, Section 9.7.4.4, pp. 903-904 [ doi:10.1107/97809553602060000623 ]
... of the geometric class The symmorphic space groups are in a one-to-one correspondence with the arithmetic crystal classes, and ... I4 1 None P4/n 1 P42/n 3 I41/a 12 P21c 17 I2d 1 I41/acd 1 4/m ... molecules of these symmetries in space groups of higher symmetry. A few are in fact to be found in non- ...

Other symmetries
Wilson, A. J. C., Karen, V. L. and Mighell, A.  International Tables for Crystallography (2006). Vol. C, Section 9.7.4.3, p. 903 [ doi:10.1107/97809553602060000623 ]
... their `order' (Hahn, 2005, Section 10.1.4.1 ), and all numbers show a general decrease with increasing order. When molecular symmetry is used ... Hahn, Th. (2005). Editor. International tables for crystallography, Vol. A, Space-group symmetry, fifth edition. Heidelberg: Springer. International Tables for ...

Positions with symmetry
Wilson, A. J. C., Karen, V. L. and Mighell, A.  International Tables for Crystallography (2006). Vol. C, Section 9.7.4.2, pp. 902-903 [ doi:10.1107/97809553602060000623 ]
... symmetry element, the special position can still be occupied by a molecule of symmetry only, but when the encumbrance is syntropic or atropic the position cannot accommodate such a molecule. Table 9.7.2.1 indicates that there are 38 space groups ... in which the centre of symmetry is actually used by a molecule. The three space groups with no special positions ...

Positions with symmetry 1
Wilson, A. J. C., Karen, V. L. and Mighell, A.  International Tables for Crystallography (2006). Vol. C, Section 9.7.4.1, p. 902 [ doi:10.1107/97809553602060000623 ]
... one molecule in the general Wyckoff position is given as a superscript in brackets. It will be noticed immediately that structures ... no examples; three (P42, P4/n and ) are credited with a single example each. The frequency of space groups increases rapidly ... crystals: new statistical data. Acta Cryst. A51, 473-481. Wilson, A. J. C. (1993d). Space groups rare for organic ...

Use of molecular symmetry
Wilson, A. J. C., Karen, V. L. and Mighell, A.  International Tables for Crystallography (2006). Vol. C, Section 9.7.4, pp. 902-904 [ doi:10.1107/97809553602060000623 ]
... one molecule in the general Wyckoff position is given as a superscript in brackets. It will be noticed immediately that structures ... no examples; three (P42, P4/n and ) are credited with a single example each. The frequency of space groups increases rapidly ... symmetry element, the special position can still be occupied by a molecule of symmetry only, but when the encumbrance is ...

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