Geodesic
Density bounds for outer parallel domains of unit ball packings
Informatics and Automation, Geometry, topology, and applications, Tome 288 (2015), pp. 230-247.

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We give upper bounds for the density of unit ball packings relative to their outer parallel domains and discuss their connection to contact numbers. We also introduce packings of soft balls and give upper bounds for the fraction of space covered by them. 
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Károly Bezdek; Zsolt Lángi. Density bounds for outer parallel domains of unit ball packings. Informatics and Automation, Geometry, topology, and applications, Tome 288 (2015), pp. 230-247. http://geodesic.mathdoc.fr/item/TRSPY_2015_288_a15/

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