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

International Tables for Crystallography (2016). Vol. A, ch. 3.1, p. 708

Figure 3.1.2.2 

H. Burzlaffa and H. Zimmermannb
[Figure 3.1.2.2]
Figure 3.1.2.2

Delaunay reduction of Gruber's example (cf. Section 3.1.2.4[link]). The edges of Selling tetrahedra are labelled by the scalar products of the vectors which designate the corners of the tetrahedra.