The paper structurally characterizes packing-chromatic-critical graphs of radius 1 and completely determines the critical cactus graphs of radius 2 with diameter 2 or 3.
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Packing chromatic critical graphs with radius at most 2
The paper structurally characterizes packing-chromatic-critical graphs of radius 1 and completely determines the critical cactus graphs of radius 2 with diameter 2 or 3.