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Jitomirskaya, S.; Simon, B. (1994). “Operators with singular continuous spectrum, III. Almost periodic Schrödinger operators”. Comm. Math. Phys.165 (1): 201–205. Zbl0830.34074.
Last, Y.; Simon, B. (1999). “Eigenfunctions, transfer matrices, and absolutely continuous spectrum of one-dimensional Schrödinger operators”. Invent. Math.135 (2): 329–367. doi:10.1007/s002220050288.
Avron, J.; Simon, B. (1982). “Singular continuous spectrum for a class of almost periodic Jacobi matrices”. Bull. Amer. Math. Soc.6 (1): 81–85. Zbl0491.47014.
Jitomirskaya, S.; Simon, B. (1994). “Operators with singular continuous spectrum, III. Almost periodic Schrödinger operators”. Comm. Math. Phys.165 (1): 201–205. Zbl0830.34074.