1. S. Banach. Théorie des Opérations Linéaires. Warsaw, 1932.
2. N. H. Bingham, C. M. Goldie, and J. L. Teugels. Regular Variation, volume 27 of Encyclopedia of Mathematics and its Applications. Cambridge University Press, Cambridge, 1987.
3. P. J. Brockwell and R. A. Davis. Time Series: Theory and Methods. Springer Series in Statistics. Springer-Verlag, New York, second edition, 1991.
4. H. Dym and H. P. McKean. Fourier Series and Integrals. Academic Press, New York, 1972.
5. P. R. Halmos. Measure Theory. Van Nostrand, New York, 1950.