MAZUR, Marcin and OPROCHA, Piotr. Subshifts, rotations and the specification property. Topological Methods in Nonlinear Analysis. Online. 1 December 2015. Vol. 46, no. 2, pp. 799 - 812. [Accessed 22 July 2024]. DOI 10.12775/TMNA.2015.077.