References
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- Gunderson N. R., “Nonlinear Electro-optical System𥀝, U.S. Patent 2,545,871 Nov. 30, 1948.
- Struve H., “Beitrag zur Theorie der Diffraction des Fernrohres” Ann.d. Phys, U. Chem., 17, 1008, (1882).