J. Louet, F. Santambrogio: A sharp inequality for transport maps in $W^{1,p}(\mathbb{R})$ via approximation Applied Math Letters Vol. 25, N. 3, p. 648-653, 2012 J. Louet: Some results on Sobolev spaces with respect to a measure and applications to a new transport problem Journal of Mathematical Sciences Vol. 196, N. 2, p. 152-164, 2014 J. Louet: Optimal transport problems with gradient penalization (Phd Thesis) 2014 L. De Pascale, J. Louet, F. Santambrogio: The Monge problem with vanishing gradient penalization: vortices and asymptotic profile J. Math. Pures Appl. Vol. 106, N. 2, p. 237-279, 2016 J. Louet, A. Pratelli, F. Zeisler: On the continuity of the total cost in the mass transport problem with relativistic cost functions (Submitted Paper) 2016 L. De Pascale, J. Louet: A study of the dual problem of the one-dimensional $L^\infty$-optimal transport problem with applications (Submitted Paper) 2017 S. Di Marino, J. Louet: The entropic regularization of the Monge problem on the real line SIAM J. Math. Anal. Vol. 50, N. 4, p. 3451-3477, 2018