International Tables for Crystallography (2011). Vol. A1, ch. 2.1, pp. 72-96   | 1 | 2 |
https://doi.org/10.1107/97809553602060000797

Chapter 2.1. Guide to the subgroup tables and graphs

Related articles

Related articles within International Tables are as follows:

Volume A: Space-group symmetry (first online edition, 2006)

Volume A1: Symmetry relations between space groups (second online edition, 2011)