1. [1] E. Acerbi, G. Buttazzo, N. Fusco, Semicontinuity and Relaxation for Integrals Depending on Vector Valued Functions, J.Math.Pure et Appl. 62 (1983), 371-387.
2. [2] L. Ambrosio, B. Kircheim, Rectifiable sets in metric and Banach spaces, Math. Ann. 318 (3) (2000) 527–555.
3. [3] L. Ambrosio, B. Kircheim, Metric currents, Acta Mathematica 185 no. 1(2000), 1-80.
4. [4] L. Ambrosio, N. Fusco, D. Pallara, Function of Bounded Variations and Free Discontinbuity Problems,Oxford University Press,New York, 2000.
5. [5] L. Ambrosio, P. Tilli, Topics on Analysis in Metric Spaces, Oxford University Press, 2004.