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 Results for DC.creator="D." AND DC.creator="W." AND DC.creator="J." AND DC.creator="Cruickshank" in section 18.5.5 of volume F
Application of the modified Fourier method
Cruickshank, D. W. J.  International Tables for Crystallography (2012). Vol. F, Section 18.5.5.3, pp. 505-506 [ doi:10.1107/97809553602060000859 ]
... between Fourier and least-squares methods demonstrated by Cochran (1948), Cruickshank (1949b, 1952, 1959), and Cruickshank & Robertson (1953), closely similar estimates of the precision of individual ... diffraction-component precision index (DPI) and Luzzati plots. References Cochran, W. (1948). The Fourier method of crystal-structure analysis. ...

The modified Fourier method
Cruickshank, D. W. J.  International Tables for Crystallography (2012). Vol. F, Section 18.5.5.2, p. 505 [ doi:10.1107/97809553602060000859 ]
... derivative) divided by the curvature (second derivative) at the peak (Cruickshank, 1949a), i.e., However, atomic positions are affected by finite-series ... criterion this becomes the basis of the modified Fourier method (Cruickshank, 1952, 1959, 1999; Bricogne, 2008, Section 1.3.4.4.7.5 ), which, like the ... an estimate of the r.m.s. uncertainty at a general position (Cruickshank & Rollett, 1953) in the slope of the difference map, ...

Block calculations
Cruickshank, D. W. J.  International Tables for Crystallography (2012). Vol. F, Section 18.5.5.1, p. 505 [ doi:10.1107/97809553602060000859 ]
... Vagin, A. A., Lebedev, A., Wilson, K. S. & Dodson, E. J. (1999). Efficient anisotropic refinement of macromolecular structures using FFT. Acta Cryst. D55, 247-255. Tronrud, D. E. (1999). The efficient calculation of the normal matrix ... of macromolecular structures. Acta Cryst. A55, 700-703. Watenpaugh, K. D., Sieker, L. C., Herriott, J. R. & Jensen, L. H. ( ...

Approximate methods
Cruickshank, D. W. J.  International Tables for Crystallography (2012). Vol. F, Section 18.5.5, pp. 505-506 [ doi:10.1107/97809553602060000859 ]
... derivative) divided by the curvature (second derivative) at the peak (Cruickshank, 1949a), i.e., However, atomic positions are affected by finite-series ... criterion this becomes the basis of the modified Fourier method (Cruickshank, 1952, 1959, 1999; Bricogne, 2008, Section 1.3.4.4.7.5 ), which, like the ... an estimate of the r.m.s. uncertainty at a general position (Cruickshank & Rollett, 1953) in the slope of the difference map, ...

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