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Empirical space-group frequencies
Wilson, A. J. C., Karen, V. L. and Mighell, A.  International Tables for Crystallography (2006). Vol. C, Section 9.7.3, p. 902 [ doi:10.1107/97809553602060000623 ]
... Allen et al., 1991) contains assignments of space groups for a variety of different types of organic compounds. The file can ... it is easy, for example, to trace all structures having a particular space group, or those having a particular space group and a particular number of formula ...

Special positions of given symmetry
Wilson, A. J. C., Karen, V. L. and Mighell, A.  International Tables for Crystallography (2006). Vol. C, Section 9.7.2, pp. 900-902 [ doi:10.1107/97809553602060000623 ]
... Donohue (1985), Mighell, Himes & Rodgers (1983), Padmaya, Ramakumar & Viswamitra (1990), Wilson (1988, 1990, 1993b,c), but many of them hardly go beyond recognizing the fact that structures frequently made use of molecular symmetry - Wilson (1988) explicitly chose to ignore it. The early work ...

Relation to structural classes
Wilson, A. J. C., Karen, V. L. and Mighell, A.  International Tables for Crystallography (2006). Vol. C, Section 9.7.1.4, p. 900 [ doi:10.1107/97809553602060000623 ]
... 1977, and papers cited there and below) are not an a priori classification of space groups but are a classification of structures within a space-group type in accordance with the number and ...
     [more results from section 9.7.1 in volume C]

Statistical properties of the weighted reciprocal lattice
Shmueli, U. and Wilson, A. J. C.  International Tables for Crystallography (2010). Vol. B, ch. 2.1, pp. 195-214 [ doi:10.1107/97809553602060000763 ]
... to the structure-factor function. In Sections 2.1.2 and 2.1.3, a discussion is presented of the average intensity of general reflections ... centrosymmetric. These p.d.f.'s are widely applicable to structures with a large number of not too dissimilar atoms in the asymmetric ... can be satisfactorily treated with the correction-factor p.d.f.'s. A comparison of these two non-ideal methods indicates that ...

Fixed-count timing
Wilson, A. J. C.  International Tables for Crystallography (2006). Vol. C, Section 7.5.4, p. 667 [ doi:10.1107/97809553602060000608 ]
Fixed-count timing 7.5.4. Fixed-count timing The probability of a time t being required to accumulate N counts when the true counting rate is [nu] is given by a [Gamma] distribution (Abramowitz & Stegun, 1964, p. 255): The ratio N/t is a slightly biased estimate of the counting rate [nu]; the ...

Fixed-time counting
Wilson, A. J. C.  International Tables for Crystallography (2006). Vol. C, Section 7.5.3, pp. 666-667 [ doi:10.1107/97809553602060000608 ]
... to be expected when the diffractometer is set to receive a reflection is T, and the `true' number when it is ... given by (7.5.3.3) has been shown to be (Skellam, 1946; Wilson, 1978) where is the hyperbolic Bessel function of the first ... are T - kB and , respectively. The distribution of then involves a generalized Bessel function1 depending on k: for the properties ...

Counting modes
Wilson, A. J. C.  International Tables for Crystallography (2006). Vol. C, Section 7.5.2, p. 666 [ doi:10.1107/97809553602060000608 ]
... both single-crystal and powder diffractometry, the integrated intensity of a reflection is obtained as a difference between a counting rate averaged over a volume of reciprocal space ...

Distributions of intensities of diffraction
Wilson, A. J. C.  International Tables for Crystallography (2006). Vol. C, Section 7.5.1, p. 666 [ doi:10.1107/97809553602060000608 ]
... Intensities of diffraction have two distinct probability distributions: (1) the a priori probability that an arbitrarily chosen reflection of a particular substance will have a particular `true' intensity (R in the notation used below), ...

Statistical fluctuations
Wilson, A. J. C.  International Tables for Crystallography (2006). Vol. C, ch. 7.5, pp. 666-676 [ doi:10.1107/97809553602060000608 ]
... Intensities of diffraction have two distinct probability distributions: (1) the a priori probability that an arbitrarily chosen reflection of a particular substance will have a particular `true' intensity (R in the notation used below), ...

Measurement of refractive index
Larsen, E. S. Jr, Meyrowitz, R. and Wilson, A. J. C.  International Tables for Crystallography (2006). Vol. C, ch. 3.3, pp. 160-161 [ doi:10.1107/97809553602060000587 ]
Chapter 3.3. Measurement of refractive index1 This chapter gives a brief description of immersion media for use in the measurement ... of crystals are complex, and it is planned to include a full account in Volume D . What follows is restricted to a brief description of immersion media for use in the ...

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