International
Tables for Crystallography Volume C Mathematical, physical and chemical tables Edited by E. Prince © International Union of Crystallography 2006 
International Tables for Crystallography (2006). Vol. C, ch. 6.4, p. 612

Only the Bragg case for thick crystals will be considered here. The asymptotic values of A, B, and C are , , and , respectively, so that For BCx small, the integrated intensity, , is given by For BCx large, It can be shown that the parameter g (which has no relation to the parameter g used to describe the mosaicblock distribution) used by Zachariasen (1945) in discussing this case is equal to −μ/2NCF. Hence, on his y scale, The value he obtained is I_{B} = 8/3[1 − 2g], while Sabine & Blair (1992) found I_{B} = 8/3[1 − 2.36g].
References
Sabine, T. M. & Blair, D. G. (1992). The Ewald and Darwin limits obtained from the Hamilton–Darwin energy transfer equations. Acta Cryst. A48, 98–103.Zachariasen, W. H. (1945). Theory of Xray diffraction in crystals. New York: John Wiley, Dover.