A set of symmetry groups, generated by closed clusters of crystal unit cells, is described and illustrated through the orthorhombic group. In general, the groups occupy a position in group hierarchy intermediate between the full space-group and the little groups of the wave vector. High degeneracies are found for some of the representations and this feature is associated with the time-reversal operations.
P. G. Perkins and J. J. P. Stewart, J. Chem. Soc., Faraday Trans. 2, 1980, 76, 534 DOI: 10.1039/F29807600534
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