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Smolensky, Paul. Information processing in dynamical systems: Foundations of harmony theory. No. CU-CS-321-86. COLORADO UNIV AT BOULDER DEPT OF COMPUTER SCIENCE, 1986. (Link)
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Salakhutdinov, Ruslan, Andriy Mnih, and Geoffrey Hinton. Restricted Boltzmann machines for collaborative filtering. Proceedings of the 24th international conference on Machine learning. ACM, 2007.(Link)
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Hinton, Geoffrey. A practical guide to training restricted Boltzmann machines. Momentum 9.1 (2010): 926.(Link)
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If you are interested in math, this is a good tutorial: http://deeplearning.net/tutorial/rbm.html#rbm