@article{Ray_2012, title={On the upper bound of the number of modes of a multivariate normal mixture}, volume={108}, ISSN={0047-259X}, url={http://dx.doi.org/10.1016/j.jmva.2012.02.006}, DOI={10.1016/j.jmva.2012.02.006}, journal={Journal of Multivariate Analysis}, publisher={Elsevier BV}, author={Ray, Surajit and Ren, Dan}, year={2012}, month=July, pages={41–52} }