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Victor V. Kotlyar, Alexey A. Kovalev, Svetlana N. Khonina, Roman V. Skidanov, Victor A. Soifer, Henna Elfstrom, Noora Tossavainen, and Jari Turunen, "Diffraction of conic and Gaussian beams by a spiral phase plate," Appl. Opt. 45, 2656-2665 (2006)
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