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Analytic expressions and approximations for the on-axis, aberration-free Rayleigh and Debye integral in the case of focusing fields on a circular aperture
R. M. Aarts, J. J. M. Braat, P. Dirksen, S. van Haver, C. van Heesch and A. J. E. M. Janssen Journal of the European Optical Society-Rapid Publications 3 08039 (2008) https://doi.org/10.2971/jeos.2008.08039