C. Meszaros et J. Bankuti, LINE GROUPS AND MODULATED SYSTEMS - TRANSLATIONAL INVARIANCE IN MODULATED SYSTEMS, Physica status solidi. b, Basic research, 183(1), 1994, pp. 73-77
The line groups are established as the symmetry groups of modulated cr
ystals. The formula of the structure factor in the Fourier-Bessel synt
hesis for polymers is extended to modulated crystals. The existence of
translational invariance according to line groups is shown for the cr
ystals K2SeO4 and MnAu2.