M. Drton. Bernoulli, 15 (arXiv:0909.0843. IMS-BEJ-BEJ172):
736-753(September 2009)Comments: Published in at http://dx.doi.org/10.3150/08-BEJ172 the Bernoulli (http://isi.cbs.nl/bernoulli/) by the International Statistical Institute/Bernoulli Society (http://isi.cbs.nl/BS/bshome.htm).