@inproceedings{bvwz-sdchg-07
, author = {Sergey Bereg and Markus V{\" o}lker and Alexander Wolff and Yuanyi
Zhang}
, title = {Straightening Drawings of Clustered Hierarchical Graphs}
, booktitle = {Proc. 33st Annu. Conf. on Current Trends in Theory and Practice
of Informatics (SOFSEM'07)}
, year = {2007}
, series = {LNCS 4362}
, pages = {176--187}
}