@techreport{dkn05,
    author = {Döllner, Jürgen and Kirsch, Florian and Nienhaus, Marc},
    institution = {Hasso-Plattner-Institut an der Universität Potsdam},
    title = {Visualizing Design and Spatial Assembly of Interactive CSG},
    year = {2005},
    number = {7},
}