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Journal of Global Optimization
We construct formulae that assume the value 1 when and only when at least k of their n variables assume the value 1, using only conjunction and disconjunction, and having (for any fixed k) only O(nlogn) k 2log*n occurences of variables. © 1978.
Sonia Cafieri, Jon Lee, et al.
Journal of Global Optimization
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SPIE Optical Science, Engineering, and Instrumentation 1998
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IS&T/SPIE Electronic Imaging 1996
Thomas M. Cover
IEEE Trans. Inf. Theory