@inproceedings{cccg-06
, title =       "A Study of Conway's Thrackle Conjecture"
, author =      "Wei Li, Karen Daniels and Konstantin Rybnikov"
, booktitle =   "Proceedings of the 18th Canadian Conference on Computational Geometry (CCCG'06)"
, site =        "Kingston"
, year =        2006
, pages =       "7--10"
}