International
Tables for
Crystallography
Volume A
Space-group symmetry
Edited by M. I. Aroyo

International Tables for Crystallography (2015). Vol. A, ch. 1.5, p. 84

Figure 1.5.2.1 

H. Wondratscheka and M. I. Aroyob
[Figure 1.5.2.1]
Figure 1.5.2.1

Illustration of the transformation of symmetry operations [({\bi W}, {\bi w})], also called a `mapping of mappings'.