1. Behncke, H.: Absolute continuity of Hamiltonians with von Neumann-Wigner potentials. Proc. Am. Math. Soc.111, 373–384 (1991)
2. Carleson, L.: On convergence and growth of partial sums of Fourier series. Acta Math.116, 135–157 (1966)
3. Coddington, E.A., Levinson, N.: Theory of Ordinary Differential Equations. New York: McGraw-Hill, 1955, p. 92
4. del Rio, R., Makarov, N., Simon, B.: Operators with singular continuous spectrum, II. Rank one operators. Commun. Math. Phys.165, 59–67 (1994)
5. Delyon, F., Simon, B., Souillard, B.: From power pure point to continuous spectrum in disordered systems. Ann. Inst. H. Poincaré42, 283–309 (1985)