@article{25974cabc10e46f1abf61b122dc3d5a6,
title = "Singular behavior of the spectrum in the neighborhood of focus",
author = "G.J. Gbur and T.D. Visser and E. Wolf",
note = "Singular behavior of the spectrum in the neighborhood of focus",
year = "2002",
doi = "10.1364/JOSAA.19.001694",
language = "English",
volume = "19",
pages = "1694--1700",
journal = "Journal of the Optical Society of America. A, Optics, image, science, and vision",
issn = "1084-7529",
publisher = "Optica Publishing Group",
number = "8",
}