Per Sort

 @phdthesis {D-phdthesis,
   author       = {Denti,Enrico},
   title        = {Coordination of Heterogeneous Multi-Agent Systems: Programming the Interaction}, 
   year         = {1998},
   school       = {Dept. of Electronics, Computer Science and Systems (DEIS)
	           Viale Risorgimento 2, I-40136 Bologna, Italy},
}