@techreport{fuhrer:wp:vwimpl,
 author = {Patrik Fuhrer and Jacques Pasquier-Rocha},
 booktitle = {Internal Working Paper},
 month = {May},
 number = {04-04},
 organization = {Department of Informatics, University of Fribourg, Switzerland},
 pdf = {madimpl.pdf},
 title = {Virtual Worlds: From Concepts to a Distributed Implementation Framework},
 year = {2004}
}