[1] A. Calka: Topological contractions, expansions and homotheties. (to appear in Comment. Math. (Prace Mat.)).
[2] J. J. Charatonik, S. Miklos:
Images of graphs under local expansions. General Topology and its Relations to Modern Analysis and Algebra V, Proc. Fifth Prague Topol. Symp. 1981, Heldermann Verlag Berlin 1982, pp. 76-78.
MR 0680750
[3] K. Menger:
Kurven théorie. Chelsea Publ. Comp. 1967.
MR 0221475