@unpublished{TUW-120647, author = {Shirabe, Takeshi}, title = {Gerrymandering Machine: Modeling Districting Problems with Exact Contiguity}, year = {2006}, note = {invited; talk: Geoinformatik-Forum, Institute for Geoinformatics, University of M{\"u}nster, M{\"u}nster, Germany; 2006-06-12 -- 2006-06-13} }