?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Adissertation&rft.au=SHAW%2C+PATRICIA%2CH&rft.aulast=SHAW&rft.aufirst=PATRICIA%2CH&rft.degree=Doctoral&rft.date=2010&rft.title=Reasoning+about+Goal-Plan+Trees+in+Autonomous+Agents%3A+Development+of+Petri+net+and+Constraint-Based+Approaches+with+Resulting+Performance+Comparisons&rft.inst=Durham+University