@inproceedings{dfrssz-ipsma-09 , author = "Erik D. Demaine and S{\'a}ndor P. Fekete and G{\"u}nther Rote and Nils Schweer and Daria Schymura and Mariano Zelke" , title = "Integer Point Sets Minimizing Average Pairwise $\ell_1$ Distance: What is the Optimal Shape of a Town?" , booktitle = "Proc. Canad. Conf. Comput. Geom." , pages = "145--148" , year = 2009 , site = "Vancouver, BC, Canada" , url = "http://cccg.ca/proceedings/2009/cccg09_38.pdf" }