Yuan Chen 0003 Ercan Engin Kuruoglu Hing-Cheung So Longting Huang Wen-Qin Wang Density parameter estimation for additive Cauchy-Gaussian mixture. 197-200 2014 SSP https://doi.org/10.1109/SSP.2014.6884609 conf/ssp/2014 db/conf/ssp/ssp2014.html#ChenKSHW14