Distance of closest approach of two arbitrary hard ellipses in 2D
2007/Jan/17 00:46:52
Peter Palffy-Muhoray
, Xiaoyu Zheng
Additional detailed information, including source codes, corrected typos and an algorithm for finding the contact point is available via the references on the wiki page:
http://en.wikipedia.org/wiki/Distance_of_closest_approach_of_ellipses_and_ellipsoids