The following publications are possibly variants of this publication:
- ShapeShop: sketch-based solid modeling with BlobTreesRyan Schmidt, Brian Wyvill, Mario Costa Sousa, Joaquim A. Jorge. siggraph 2006: 14 [doi]
- ShapeShop: Sketch-Based Solid Modeling with BlobTreesRyan Schmidt, Brian Wyvill, Mario Costa Sousa, Joaquim A. Jorge. sbm 2005: 53-62 [doi]
- ShapeShop: Free-Form 3D Design with Implicit Solid ModelingRyan Schmidt, Brian Wyvill. In Joaquim A. Jorge, Faramarz Samavati, editors, Sketch-based Interfaces and Modeling. pages 287-312, Springer, 2011. [doi]
- Pen-and-Ink for BlobTree Implicit ModelsKevin Foster, Pauline Jepp, Brian Wyvill, Mario Costa Sousa, Callum Galbraith, Joaquim A. Jorge. cgf, 24(3):267-276, 2005. [doi]