1 论文标题Variable selection in robust joint mean and covariance model for longitudinal
data analysis　　

2 作者信息Xueying Zheng, Wing Kam Fung and Zhongyi Zhu


3 出处和链接（比如，NBER working paper No.11000）http://www3.stat.sinica.edu.tw/statistica/j24n2/J24N21/J24N21.html

4 摘要