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A. S. Besicovitch, On the fundamental geometrical properties of linearly measurable plane sets of points. II, Math. Ann. 115 (1938), 296-329. MR 1513189

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H. Federer, The rectifiable subsets of n space, Trans. Amer. Math. Soc. 62 (1947), 114-192. MR 0022594 (9:231c)

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J. M. Marstrand, Circular density of plane sets, J. London Math. Soc. 30 (1955), 238-246. MR 0067964 (16:806a)

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E. F. Moore, Density rations and rectifiability in n-space, Trans. Amer. Math. Soc. 69 (1950), 324-334. MR 0037894 (12:324b)

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A. P. Morse, The role of internal families in measure theory, Bull. Amer. Math. Soc. 50 (1944), 723-728. MR 0011107 (6:120c)

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A. P. Morse and J. F. Randolph, The rectifiable subsets of the plane, Trans. Amer. Math. Soc. 55 (1944), 236-305. MR 0009975 (5:232a)

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S. Saks, Theory of the integral, Hafner, Warsaw, 1937; §9, p. 82.