Zhou , YuXia , FengxiChen , Yan and Wang , Xuejun. (2014). Complete Convergence for Weighted Sums of Negatively Superadditive Dependent Random Variables.
            <i>Journal of Mathematical Study</i>. <i>47</i> (3).
            287-294.
         doi:10.4208/jms.v47n3.14.04