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Chernomyrdin, N. V., Frolov, M. E., Lebedev, S. P., Reshetov, I. V., Spektor, I. E., Tolstoguzov, V. L., … Zaytsev, K. I. (2017). Wide-aperture aspherical lens for high-resolution terahertz imaging. Review of Scientific Instruments, 88(1), 014703. doi:10.1063/1.4973764 
10.1063/1.4973764