@incollection{NIPS2005_843,
 author = {Kumar {Chellapilla} and Patrice Y. {Simard}},
 title = {Using Machine Learning to Break Visual Human Interaction Proofs (HIPs)},
 booktitle = {Advances in Neural Information Processing Systems 17},
 editor = {Lawrence K. Saul and Yair Weiss and {L\'{e}on} Bottou},
 publisher = {MIT Press},
 address = {Cambridge, MA},
 pages = {265-272},
 year = {2005},
 original = "0265_843.PDF",

}