ENTROPY: General: Definitions: Weisstein 98/06; General: Introductory: R. Nave's HyperPhysics site; General: Lieb and Yngvason 98/05; Lieb and Yngvason 2002/04; Type: VON NEUMANN: Petz 2001/02; Re: BLACK HOLES: Page 93/04; Wald 99/12; Black Holes, Entropy, and Information by Gary L. Horowitz [2007/08] Re: IRREVERSIBILITY: MICROSCOPIC: Rau and Müller 95/05; THE NET ADVANCE OF PHYSICS
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