1. L. Ambrosio and N. Gigli, in Lecture Notes in Math., Vol. 2062: Modelling and Optimisation of Flows on Networks (Springer, Heidelberg, 2013), pp. 1–155.
2. V. I. Bogachev and A. V. Kolesnikov, Russian Math. Surveys 67 (5), 785 (2012).
3. C. Villani, Grundlehren Math. Wiss., Vol. 338: Optimal Transport. Old and New (Springer- Verlag, Berlin, 2009).
4. J. Korman and R. J. McCann, Trans. Amer. Math. Soc. 367 (3), 1501 (2015).
5. A. N. Doledenok, Math. Notes 104 (1), 39 (2018).