1. Allard W.K.: On the first variation of a varifold. Ann. Math. 95, 417–491 (1962)
2. Ambrosio, L.: Corso introduttivo alla Teoria Geometrica della Misura ed alle Superfici Minime. Scuola Normale Superiore, PISA (1966)
3. Ambrosio L., Fusco N., Pallara D.: Functions of Bounded Variation and Free Discontinuity Problems. Clarendon Press, Oxford (2000)
4. Barozzi E.: The curvature of a boundary with finite area. Rend. Mat. Acc. Lincei 5, 149–159 (1994)
5. Barozzi E., Gonzalez E., Massari U.: The mean curvature of a Lipschitz continuous manifold. Rend. Mat. Acc. Lincei 14, 257–277 (2003)