1、【作者(必填)】Xingdong Feng & Liping Zhu   
    【文题(必填)】Estimation and Testing of Varying Coefficients in Quantile Regression
     【年份(必填)】2016
      【全文链接或数据库名称(选填)】https://www.tandfonline.com/doi/abs/10.1080/01621459.2014.1001068

2、【作者(必填)】Zeger, S.L., Diggle, P.J.,     
    【文题(必填)】 Semiparametric models for longitudinal data with application to cd4 cell numbers in HIV seroconverters
     【年份(必填)】1994
      【全文链接或数据库名称(选填)】Biometrics, 1994,689–699.