Geodesic
Time changes in flows and mixing
Izvestiya. Mathematics , Tome 7 (1973) no. 6, pp. 1273-1294.

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Let $\{U_t\}$ be an ergodic aperiodic flow in a Lebesgue space $(Y,\mu_1)$. By a time change, smooth along the trajectories of the flow and arbitrarily close to the identity, it can be transformed into a mixing flow. If, in addition, $Y$ is a compact metric space, $\{U_t\}$ is continuous and $\mu_1$ is regular, then the change may be chosen to be continuous on and equal to the identity everywhere except on an arbitrary open set of positive measure. 
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A. V. Kochergin. Time changes in flows and mixing. Izvestiya. Mathematics , Tome 7 (1973) no. 6, pp. 1273-1294. http://geodesic.mathdoc.fr/item/IM2_1973_7_6_a4/

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