1. Alexandrov, V.: An example of a one-dimensional rigid set in the plane,Siberian Math. J. 34 (6) (1993), 3–9 (in Russian).
2. Borsuk, K.: On intrinsic isometries,Bull. Acad. Pol. Sci. 29 (1981), 83–90.
3. Cobb, J.: Two examples concerning small intrinsic isometries,Fund. Math. 131 (1988), 209–213.
4. Falconer, K. J.:Fractal Geometry, Wiley, New York, 1990.
5. Herburt, I.: On intrinsic isometries and rigid subsets of Euclidean spaces,Dem. Math. 22 (1989), 1205–1227.