A Sketching Interface for Modeling the Internal Structures of 3D Shapes. Owada, S., Nielsen, F., Nakazawa, K., & Igarashi, T. In Butz, A., Krüger, A., & Olivier, P., editors, Smart Graphics, Third International Symposium, SG 2003, Heidelberg, Germany, July 2-4, 2003, Proceedings, volume 2733, of Lecture Notes in Computer Science, pages 49–57, 2003. Springer.
A Sketching Interface for Modeling the Internal Structures of 3D Shapes [link]Paper  doi  bibtex   
@inproceedings{DBLP:conf/sg/OwadaNNI03,
  author    = {Shigeru Owada and
               Frank Nielsen and
               Kazuo Nakazawa and
               Takeo Igarashi},
  editor    = {Andreas Butz and
               Antonio Kr{\"{u}}ger and
               Patrick Olivier},
  title     = {A Sketching Interface for Modeling the Internal Structures of 3D Shapes},
  booktitle = {Smart Graphics, Third International Symposium, {SG} 2003, Heidelberg,
               Germany, July 2-4, 2003, Proceedings},
  series    = {Lecture Notes in Computer Science},
  volume    = {2733},
  pages     = {49--57},
  publisher = {Springer},
  year      = {2003},
  url       = {https://doi.org/10.1007/3-540-37620-8\_5},
  doi       = {10.1007/3-540-37620-8\_5},
  timestamp = {Tue, 14 May 2019 10:00:54 +0200},
  biburl    = {https://dblp.org/rec/conf/sg/OwadaNNI03.bib},
  bibsource = {dblp computer science bibliography, https://dblp.org}
}

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