References

    [1]  G. T. Toussaint, "Movable separability of sets", in Computational Geometry, Ed., G. T. Toussaint,  North-Holland, 1985, pp. 335-375.
    •     compressed PostScript file  separability.survey.ps.gz

    Other links:        Mobility of Objects in Space.

    [2]  L. J.  Guibas and F. F. Yao, "On translating a set of rectangles",
    Proc. Twelfth Annual ACM Symposium on Theory of Computing, 1980, pp.154-160.

    [3] T. Ottman and P. Widmayer, "On translating a set of line segments",
    Computer Vision, Graphics, and Image Processing, vol. 24, 1983, pp. 382-389.
     
     [4] J. O'Rourke, Computational Geometry in C, Cambridge University Press, 1994.