@Book{ dixfislevste04, editor = {J\"{u}rgen Dix and Michael Fisher and Hector Levesque and Leo Sterling}, title = {{L}ogic {B}ased {I}mplementation of {A}gent {S}ystems}, publisher = {Baltzer Science Publishers}, series = {{S}pecial Issue of the Annals in Mathematics and Artificial Intelligence}, volume = {}, number = {}, year = {2004} }