J. Drager et Nd. Mermin, SUPERSPACE GROUPS WITHOUT THE EMBEDDING - THE LINK BETWEEN SUPERSPACEAND FOURIER-SPACE CRYSTALLOGRAPHY, Physical review letters, 76(9), 1996, pp. 1489-1492
The symmetry classification of three-dimensional periodic or aperiodic
crystals is given a coordinate independent formulation which establis
hes the precise connection between Fourier-space and superspace crysta
llography. Superspace groups emerge without having to embed an aperiod
ic crystal in a higher-dimensional space.