
REFERENCES

H. Brown, R. Bülow, J. Neubüser, H. Wondratschek and H. Zassenhaus, Crystallographic Groups of FourDimensional Space. Wiley, NY, 1978, p. 52.
P. Engel, Geometric crystallography, in P. M. Gruber and J. M. Wills, editors, Handbook of Convex Geometry. NorthHolland, Amsterdam, Vol. B, pp. 9891041.
J. E. Goodman and J. O'Rourke, editors, Handbook of Discrete and Computational Geometry, CRC Press, 1997, p. 102.
T. Janssen, Crystallographic Groups. NorthHolland, Amsterdam, 1973, p. 119.
N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).


LINKS

Table of n, a(n) for n=0..4.
Dror BarNatan, Illustrations of 2dimensional symmetry groups
Experimental Mathematics, Home Page
J. Neubüser, B. Souvignier and H. Wondratschek, Corrections to Crystallographic Groups of FourDimensional Space by Brown et al. (1978) [New York: Wiley and Sons], Acta Cryst., A58 (2002), 301.
J. Opgenorth, W. Plesken and T. Schulz, Crystallographic Algorithms and Tables, Acta Cryst., A54 (1998), 517531.
W. Plesken, J. Opgenorth and T. Schulz, CARAT  a package for mathematical crystallography, Journal of Applied Crystallography, 31 (1998), 827828.
W. Plesken and T. Schulz, CARAT Homepage
W. Plesken and T. Schulz, Counting crystallographic groups in low dimensions, Experimental Mathematics 9 (No. 3, 2000) 407411.
B. Souvignier, Enantiomorphism of crystallographic groups in higher dimensions with results in dimensions up to 6, Acta Cryst., A59 (2003), 210220.
The Fascination of Crystals and Symmetry, 230 (The space group list project)
Wikipedia, Space group
