ベッケンシュタイン境界
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Jacob D. Bekenstein, "Communication and energy", Physical Review A, Vol. 37, Issue 9 (May 1988), pp. 3437-3449, doi:10.1103/PhysRevA.37.3437, Bibcode: 1988PhRvA..37.3437B . Mirror link.
Marcelo Schiffer and Jacob D. Bekenstein, "Proof of the quantum bound on specific entropy for free fields", Physical Review D, Vol.