@article{montufar2011refinements,
	Author = {Mont\'ufar, Guido and Ay, Nihat},
	Journal = {Neural Computation},
	Number = {5},
	Pages = {1306--1319},
	Publisher = {MIT Press 238 Main St., Suite 500, Cambridge, MA 02142-1046, USA email: journals-info@ mit. edu},
	Title = {Refinements of universal approximation results for deep belief networks and restricted {B}oltzmann machines},
	Volume = {23},
	Year = {2011},
	}