@inproceedings{CTT100586620,
  author = {Satoshi Tayu and Takuya Ooshima and Shuichi UENO},
  title = {On the Three-Dimensional Orthogoanl Drawing of Outerplanar Graphs (Extended Abstract)},
  booktitle = {Proceedings of 2009 IEEE International Symposium on Circuits and      Systems},
  year = 2009,
}

@inproceedings{CTT100571840,
  author = {Satoshi Tayu and Takuya Ooshima and Shuichi UENO},
  title = {On the Three-Dimensional Orthogonal Drawing of Outerplanar Graphs},
  booktitle = {Technical Report of the IPSJ},
  year = 2008,
}

@inproceedings{CTT100552920,
  author = {Takuya Ooshima and Satoshi Tayu and Shuichi UENO},
  title = {On the Three-Dimensional Orthogonal Drawing of Outerplanar Graphs},
  booktitle = {Technical Report of the IEICE},
  year = 2008,
}