00290nam a2200121Ia 4500082001800000100003000018245003600048260002500084300001000109490003900119500000500158700000500163  a512bSc411.ND  aSchwarzenberger, R. L. E.  aN-dimensional crystallographyb  aLondonbPitmanc1980  a139p.  aResearch notes in Mathematicsv 41  a  a