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It is generally known that a symmetrical bootlace lens having two pairs of conjugate foci can be designed. Additionally, there is a bootlace lens, the R-2R, which focuses perfectly at infinitely many points. It is shown in this paper that the R-2R is unique; there are no other perfect bootlace lenses and, in fact, no others with more than two pairs of conjugate off-axis foci. 相似文献
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Dunkelman Orr Eichlseder Maria Kales Daniel Keller Nathan Leurent Gatan Schofnegger Markus 《Designs, Codes and Cryptography》2022,90(4):983-1007
Designs, Codes and Cryptography - FlexAEAD is a block cipher candidate submitted to the NIST Lightweight Cryptography standardization project, based on repeated application of an... 相似文献
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