International
Tables for Crystallography Volume A1 Symmetry relations between space groups Edited by Hans Wondratschek and Ulrich Müller © International Union of Crystallography 2011 
International Tables for Crystallography (2011). Vol. A1, ch. 2.1, pp. 7677
Section 2.1.3.2. A description in close analogy with IT A^{a}Institut für Kristallographie, Universität, D76128 Karlsruhe, Germany, and ^{b}Departamento de Física de la Materia Condensada, Facultad de Ciencias, Universidad del País Vasco, Apartado 644, E48080 Bilbao, Spain 
The listing is similar to that of IT A and presents on one line the following information for each subgroup : Conjugate subgroups are listed together and are connected by a left brace.
The symbols have the following meaning:
Remarks

In general, the numbers in the list `Sequence' of follow the order of the numbers in the group , i.e. they rise monotonically. Sometimes this sequence is modified because those entries which have the same additional translations are joined together, see, e.g. the maximal ksubgroups of with `Loss of centring translations'. In addition, in a class of conjugate subgroups, the monotonically rising order may be obeyed only for the first member of the conjugacy class. The order of the other members is then determined by the conjugation of the first member. (In IT A the monotonically rising order of the numbers is kept in all conjugate subgroups.)
Example 2.1.3.2.1
, No. 221, tetragonal tsubgroups
I Maximal translationengleiche subgroupsComments:
If is the order of the first sequence, then the second sequence follows the order , , . Here the C means a threefold rotation and is the conjugating element; for the second subgroup of the general position of ; for the third subgroup . In this example the columns w of the symmetry operations (and thus of the conjugating elements) are the zero columns o and could be omitted.
The description of the subgroups can be explained by the following four examples.
Example 2.1.3.2.4
, No. 137, ORIGIN CHOICE 2
I Maximal translationengleiche subgroups
…
(59, ) 1; 2; 5; 6; 9; 10; 13; 14
Comments:

Example 2.1.3.2.5
, No. 151
I Maximal translationengleiche subgroupsComments:
