A modified likelihood ratio test for homogeneity in bivariate normal mixtures of two samples. - Qingzhu Lei; Yongsong Qin (J. Syst. Sci. Complex., 2009)

Confidence intervals for nonparametric regression functions with missing data: Multiple design case. - Qingzhu Lei; Yongsong Qin (J. Syst. Sci. Complex., 2011)

Joint empirical likelihood confidence regions for a finite number of quantiles under negatively associated samples. - Yongsong Qin; Yinghua Li; Qingzhu Lei (J. Syst. Sci. Complex., 2015)

Empirical likelihood for partially linear models under negatively associated errors. - Qingzhu Lei; Yongsong Qin (J. Syst. Sci. Complex., 2016)