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Veldkamp, Wilfrid B.; Allen, Eric J. Van. (1983).
Binary holographic LO beam multiplexer for IR imaging detector arrays. ao/22/10/ao-22-10-1497.pdf, 22(10), 1497–0.
doi:10.1364/AO.22.001497
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research
