András Bezdek, Wlodzimierz Kuperberg. Unavoidable Crossings in a Thinnest Plane Covering with Congruent Convex Disks. Discrete & Computational Geometry, 43(2):187-208, 2010. [doi]
@article{BezdekK10,
title = {Unavoidable Crossings in a Thinnest Plane Covering with Congruent Convex Disks},
author = {András Bezdek and Wlodzimierz Kuperberg},
year = {2010},
doi = {10.1007/s00454-008-9113-7},
url = {http://dx.doi.org/10.1007/s00454-008-9113-7},
researchr = {https://researchr.org/publication/BezdekK10},
cites = {0},
citedby = {0},
journal = {Discrete & Computational Geometry},
volume = {43},
number = {2},
pages = {187-208},
}