Shuangqing Wei Rajgopal Kannan S. Sitharama Iyengar Nageswara S. V. Rao Energy Efficient Estimation of Gaussian Sources over Inhomogeneous Gaussian MAC Channels. 4647-4651 2008 GLOBECOM http://dx.doi.org/10.1109/GLOCOM.2008.ECP.890 conf/globecom/2008 db/conf/globecom/globecom2008.html#WeiKIR08