1. Ambrosio L.: Movimenti minimizzanti. Rend. Accad. Naz. Sci. XL Mem. Mat. Sci. Fis. Nat. 113, 191–246 (1995)
2. Ambrosio, L., Gigli, N., Savaré, G.: Gradient flows in metric spaces and in the space of probability measures, Lectures in Math., ETH Zürich, (2005)
3. Bouchitté G., Buttazzo G.: New lower semicontinuity results for nonconvex functionals defined on measures. Nonlinear Anal. 15(7), 679–692 (1990)
4. Buttazzo, G.: Semicontinuity, Relaxation, and Integral Representation in the Calculus of Variations. Longman Scientific & Technical, Essex, 1989
5. Buttazzo, G., Santambrogio, F.: A model for the optimal planning of an urban area. SIAM J. Math. Anal. 37(2), 514–530 (2005)