@inproceedings{db05,
    author = {Döllner, Jürgen and Buchholz, Henrik},
    booktitle = {13th ACM International Symposium of Geographical Information Systems (ACM GIS)},
    title = {Continuous Level-of-Detail Modeling of Buildings in Virtual 3D City Models},
    year = {2005},
    pages = {173--181},
    publisher = {ACM Press},
}