@phdthesis{FuhrerThesis, address = {Department of Informatics}, author = {Patrik Fuhrer}, booktitle = {Doctoral thesis (No. 1458)}, month = {September}, organization = {University of Fribourg, Switzerland}, pdf = {FuhrerThesis.pdf}, title = {Distributed Virtual Worlds: Abstract Model and Design of the MaDViWorld Software Framework}, year = {2004} }