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\bibcite{antonio01}{de Antonio, et al., 2001}
\bibcite{bandai}{Bandai, 1997}
\bibcite{beer99}{Beer, 1999}
\bibcite{be95b}{Bell, 1995}
\bibcite{bh97}{Bell and Huang, 1997}
\bibcite{blaxxun}{Blaxxun, 2000}
\bibcite{broll:2000}{Broll et al., 2000}
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\bibcite{adaptive}{Brusilovsky, 1996}
\bibcite{agents}{Caglayan, 1997}
\bibcite{capin97}{Capin et al., 1997}
\bibcite{carson99}{Carson et al., 1999}
\bibcite{search}{Cheong, 1996}
\bibcite{cl90}{Cohen and Levesque, 1990}
\bibcite{creative}{Creature Labs, 1999}
\bibcite{curiouslab}{Curious Labs}
\bibcite{dlp}{DLP web site, 2001}
\bibcite{ea98}{Earnshaw, et al., 1998}
\bibcite{eliens:1992}{Eli\"ens, 1992}
\bibcite{OO}{Eli\"ens, 2000}
\bibcite{platform}{Eli\"ens et al., 2002}
\bibcite{fa97}{Faure, 1997}
\bibcite{fifa}{FIFA, 2001}
\bibcite{kqml}{Finin and Fritzson, 1994}
\bibcite{fipa}{FIPA, 1999}
\bibcite{fr88}{Freach, 1988}
\bibcite{gw96}{Graham, 1996}
\bibcite{hanim}{H-anim, 2001}
\bibcite{harel84}{Harel, 1984}
\bibcite{huang:2000}{Huang et al., 2000}
\bibcite{huang:2001}{Huang et al., 2001}
\bibcite{huang:2001b}{Huang et al., 2001b}
\bibcite{huang:2002}{Huang et al., 2002}
\bibcite{step}{Huang et al., 2002b}
\bibcite{living-worlds}{Living Worlds}
\bibcite{liu99}{Liu, 1999}
\bibcite{liu01}{Liu and Ye, 2001}
\bibcite{vrml}{ISO, 1997}
\bibcite{vrmleai}{ISO, 1997b}
\bibcite{roadmap:1998}{Jennings et al., 1998}
\bibcite{klusch99}{Klusch, 1999}
\bibcite{klusch03}{Klusch et al, 2003}
\bibcite{knoblock97}{Knoblock, 1997}
\bibcite{maes}{Maes, 1997}
\bibcite{messmer}{Messmer}
\bibcite{mimaze}{MiMaze}
\bibcite{mud}{MUD, 2000}
\bibcite{negro}{Negroponte, 1995}
\bibcite{pg96}{Perlin and Goldberg, 1996}
\bibcite{intelligent}{Petrie, 1997}
\bibcite{ps2002}{Prendiner et al., 2002}
\bibcite{rao:1991}{Rao and Georgeff, 1991}
\bibcite{rao:1995}{Rao and Georgeff, 1991}
\bibcite{rcr:1999}{Reitmayr et al., 1999}
\bibcite{reynolds87}{Reynolds, 1987}
\bibcite{re99}{Reynolds, 1999}
\bibcite{robocup}{Robocup, 1999}
\bibcite{roth99}{Roth, 1999}
\bibcite{rn95}{Russell and Norvig, 1995}
\bibcite{shoemake85}{Schoemake, 1985}
\bibcite{se69}{Searle, 1969}
\bibcite{su98}{Subrahmanian, 1998}
\bibcite{takahashi:1999}{Takahashi, 1999}
\bibcite{vesl}{VESL}
\bibcite{wasp}{WASP, 2000}
\bibcite{watson:1996}{Watson, 1996}
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