P. Zeiner et al., Comments on the decomposition of the regular representation of crystallographic space groups into band representations, J PHYS A, 33(8), 2000, pp. 1631-1646
We discuss the decomposition of the regular representation of crystallograp
hic space groups into elementary band representations. It is shown that the
decomposition is in general not unique. In particular, we discuss some ort
horhombic space groups in detail.