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Figure 2
The two interpenetrated nine-vertex polyhedra forming the 18-electron valence shell in Kr. Different-spin electrons are displayed in white and yellow. HF+J results.

IUCrJ
Volume 11| Part 2| March 2024| Pages 210-223
ISSN: 2052-2525
https://doi.org/10.1107/S2052252524000915