1. [B] A. S. Besicovitch,Parametric surfaces III: Surfaces of minimum area, J. London Math. Soc.,23 (1948), 241–246; III, I. Nederl. Akad. Wetensch. Proc. Ser. A,57 (1954), 169–175.
2. [Cc] J. Cecconi,Sul teorema di Stokes, Rivista Mat. Univ. Parma,3 (1952), 233–264.
3. [Ce] L. Cesari,Surface Area, Princeton Univ. Press, 1956.
4. [Co] R. Courant,Dirichlet's Principle, Conformal Mapping, and Minimal Surfaces, Interscience, 1950.
5. [Fe 1] H. Federer,A note on the Gauss-Green theorem, Proc. Am. Math. Soc.,9 (1958), 447–451.