@article{bdp-sdp-08
, author = {Sergey Bereg and Adrian Dumitrescu and J{' a}nos Pach}
, title = {Sliding Disks in the Plane}
, journal = {Int. J. Comput. Geom. Appl.}
, year = {2008}
, volume = {18}
, number = {5}
, pages = {373--387}
}