求下面论文的补充资料（定理证明和软件包）
title:Empirical Likelihood in Missing Data Problems
author:Jing Qin, Biao Zhang and Denis H. Y. Leung
Journal of the American Statistical Association, 2009, vol. 104, issue 488, pages 1492-1503
Date: 2009
Downloads: http://pubs.amstat.org/toc/jasa/104/488