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Volume 9 (1980)

Editorial

H. -B. Buergi: Space Group-Like Symmetries in the Conformational Analysis of Flexible Molecules, pp.13-14
A. W. M. Dress: A Mathematical Note on Koptsik's Definition of Imperfect Crystals, pp.15-20
K. Fichtner: On Groupoids in Crystallography, pp.21-40
J. N. Kotzev: On the New Types of Colour Symmetry Groups, pp.41-50
W. Opechowski: Reamrks on Metacrystallographic Groups, pp. 51-64

H. S. M. Coxeter: Higher-Dimensional Analogues of the Tetrahedrite Crystal Twin, pp.67-72
M. S. Delaney: Quasi Symmetries of Space Group Orbits, pp.73-80
A. W. M. Dress: On the Classification and Generation of Two- and Higher-Dimensional Regular Patterns, pp.81-100
W. Fischer: Normal Homogeneous Partitions of Three-Dimensional Euclidean Space which are not Partitions into Fundamental Regions of a Space Group, pp. 101-101
W. Fischer: On a Space-Filling Polyhedron with 26 Faces, pp. 103-103
W. E. Klee: Topological Aspects of Crystallography, pp.105-120
H. Wondratschek: Crystallographic Orbits, Lattice Complexes, and Orbit Types, pp.121-125
H. Zassenhaus: On the Sphere Packing Problem, pp.127-135

H. Baernighausen: Group-Subgroup Relations between Space Groups: A Useful Tool in Crystal Chemistry, pp. 139-175
Y. Billiet: The Subgroups of Finite Index of the Space Groups: Determination via Conventional Coordinate Systems, pp. 177-190
K. -J. Koehler: Subgroup-Relations between Crystallographic Groups, pp. 191-207

N. Backhouse: An Equivalence Test for Multipliers of Projective Representations of Solvable Groups, pp. 211-217
N. Backhouse: Clifford Theory and Its Application to the Representation Theory of Crystallographic Space Groups, pp. 219-225
A. P. Cracknell: Irreducible Representations of Point Groups and Space Groups - The Last 50 Years and the Next 10 Years, pp. 227-241
R. Dirl: Selection Rules for Magnetic Groups. Application to Type II Shubnikov Space Groups, pp. 243-256
J. N. Kotzev, M. I. Aroyo: Clebsch-Gordan Coefficients for the Corepresentations of Shubnikov Point Groups, pp. 257-258