János Pach, Andrew Suk, Miroslav Treml. Tangencies between families of disjoint regions in the plane. Comput. Geom., 45(3):131-138, 2012. [doi]
@article{PachST12,
title = {Tangencies between families of disjoint regions in the plane},
author = {János Pach and Andrew Suk and Miroslav Treml},
year = {2012},
doi = {10.1016/j.comgeo.2011.10.002},
url = {http://dx.doi.org/10.1016/j.comgeo.2011.10.002},
researchr = {https://researchr.org/publication/PachST12},
cites = {0},
citedby = {0},
journal = {Comput. Geom.},
volume = {45},
number = {3},
pages = {131-138},
}