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Bibliography

[1]

A. S. Besicovitch, A general form of the covering principle and relative differentiation of additive functions. II, Proc. Cambridge Philos. Soc. 42 (1946), 1-10. MR 0014414 (7:281e)

[2]

M. Brelot and J. L. Doob, Limites angulaires et limites fines, Ann. Inst. Fourier (Grenoble) 13 (1963), 395-415. MR 0196107 (33:4299)

[3]

A. P. Calderón, On the behavior of harmonic functions at the boundary, Trans. Amer. Math. Soc. 68 (1950), 47-54.

[4]

L. Carleson, On the existence of boundary values for harmonic functions of several variables, Ark. Mat. 4 (1962), 393-399. MR 0159013 (28:2232)

[5]

I. G. Petrovsky, Lectures on partial differential equations, Interscience, New York, 1954. MR 0065760 (16:478f)

[6]

S. Saks, Theory of the integral, Stechert, New York, 1937.

[7]

K.-O. Widman, On the boundary values of harmonic functions in , Ark. Mat. 5 (1964), 221-230. MR 0201662 (34:1544)

[8]

A. Zygmund, Trigonometric series, 2nd ed., Cambridge Univ. Press, New York, 1959. MR 0107776 (21:6498)