1. E. M. Stein, Singular Integrals and Differentiability Properties of Functions, Princeton Math. Ser. 30, Princeton Univ. Press, Princeton, 1970.
2. J. Beck, A two-dimensional van Aardenne-Ehrenfest theorem in irregularities of distribution, Compositio Math. 72 (1989), 269--339.
3. J. Beck and W. W. L. Chen, Irregularities of Distribution, Cambridge Tracts in Math. 89, Cambridge Univ. Press, Cambridge, 1987.
4. D. Bilyk, M. T. Lacey, and A. Vagharshakyan, On the small ball inequality in all dimensions, preprint,\arxiv0705.4619v3[math.CA]
5. D. L. Burkholder, ``Sharp inequalities for martingales and stochastic integrals'' in Colloque Paul Lévy sur les Processus Stochastiques (Palaiseau, France, 1987), Astérisque 157 --158., Soc. Math. France, Montrouge, 1988, 75--94.