Therese 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. Locked and Unlocked Polygonal Chains in Three Dimensions. Discrete & Computational Geometry, 26(3):269-281, 2001. [doi]
Abstract is missing.