Media type: E-Article Title: Semiparametric Estimation of Covariance Matrixes for Longitudinal Data Contributor: Fan, Jianqing; Wu, Yichao Published: Informa UK Limited, 2008 Published in: Journal of the American Statistical Association, 103 (2008) 484, Seite 1520-1533 Language: English DOI: 10.1198/016214508000000742 ISSN: 0162-1459; 1537-274X Origination: Footnote: