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[1]Soskin, M. S., Vasnetsov, M. V., Singular optics, in Progress in Optics (ed. Wolf, E.), Amsterdam: Elsevier, 2001, 42: 219-276.[2]Gbur, G., Visser, T. D., Wolf, E., Anomalous behavior of spectra near phase singularities of focused waves, Phys. Rev. Let