1.标题：Maximum likelihood from incomplete data via the EM algorithm

  作者：A. P. Dempster, N. M. Laird and D. B. Rubin

  出版社：Journal of the Royal Statistical Society. Series B (Methodological), Vol. 39, No. 1 (1977), pp. 1-38   (article consists of 38 pages)

  电子链接：http://www.jstor.org/pss/2984875

2.标题：Identification in paramertric models

  作者：Thomas J. Rothenberg 

  出版社：Econometrica, Vol. 39, No. 3 (May, 1971), pp. 577-591   (article consists of 15 pages)

  电子链接：http://www.jstor.org/pss/1913267

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