Kamiński, B., A. Siemaszko, and J. Szymański. “On Deterministic and Kolmogorov Extensions for Topological Flows”. Topological Methods in Nonlinear Analysis, vol. 31, no. 1, Mar. 2008, pp. 191-04, https://apcz.umk.pl/TMNA/article/view/TMNA.2008.010.