@article{montufar2015does,
	Author = {{Guido Mont\'ufar} and Jason Morton},
	Journal = {SIAM Journal on Discrete Mathematics},
	Number = {1},
	Pages = {321--347},
	Title = {When Does a Mixture of Products Contain a Product of Mixtures?},
	Volume = {29},
	Year = {2015},
	url={http://epubs.siam.org/doi/10.1137/140957081},
}