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Figure 1
A schematic diagram indicating the group–subgroup relationships among the 15 space groups tabulated by Howard & Stokes (1998BB1). A dashed line joining a group with its subgroup indicates that the corresponding phase transition is required by Landau theory to be first order.

Journal logoSTRUCTURAL SCIENCE
CRYSTAL ENGINEERING
MATERIALS
ISSN: 2052-5206
Volume 58| Part 3| June 2002| Page 565
https://doi.org/10.1107/S010876810200890X
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