The following publications are possibly variants of this publication:
- Locked and Unlocked Polygonal Chains in 3DTherese C. Biedl, Erik D. Demaine, Martin L. Demaine, Sylvain Lazard, Anna Lubiw, Joseph O Rourke, Mark H. Overmars, Steve Robbins, Ileana Streinu, Godfried T. Toussaint, Sue Whitesides. soda 1999: 866-867 [doi]
- Locked and Unlocked Chains of Planar ShapesRobert Connelly, Erik D. Demaine, Martin L. Demaine, Sándor P. Fekete, Stefan Langerman, Joseph S. B. Mitchell, Ares Ribó, Günter Rote. dcg, 44(2):439-462, 2010. [doi]
- Locked and unlocked chains of planar shapesRobert Connelly, Erik D. Demaine, Martin L. Demaine, Sándor P. Fekete, Stefan Langerman, Joseph S. B. Mitchell, Ares Ribó, Günter Rote. compgeom 2006: 61-70 [doi]
- Polygonal chains cannot lock in 4DRoxana Cocan, Joseph O Rourke. comgeo, 20(3):105-129, 2001.
- Polygonal chains cannot lock in 4dRoxana Cocan, Joseph O Rourke. cccg 1999: [doi]
- On Approximating Polygonal Curves in Two and Three DimensionsDavid Eu, Godfried T. Toussaint. cvgip, 56(3):231-246, 1994.