1. L. Ambrosio, N. Fusco, D. Pallara, Functions of Bounded Variation and Free Discontinuity Problems. Oxford Mathematical Monographs (The Clarendon Press, Oxford University Press, New York, 2000), xviii+434 pp.
2. A.S. Besicovitch, A general form of the covering principle and relative differentiation of additive functions. Proc. Camb. Phil. Soc. 41, 103–110 (1945)
3. A.S. Besicovitch, A general form of the covering principle and relative differentiation of additive functions. II. Proc. Camb. Phil. Soc. 42, 1–10 (1946)
4. M. de Guzmán, Real Variable Methods in Fourier Analysis, North-Holland Mathematics Studies, vol. 46. Notas de Matemtica [Mathematical Notes], vol. 75 (North-Holland Publishing, Amsterdam-New York, 1981), xiii+392 pp.
5. H. Federer, Geometric Measure Theory. Die Grundlehren der mathematischen Wissenschaften, Band 153 (Springer-Verlag New York Inc., New York, 1969), xiv+676 pp.