1. Missing observations in multivariate statistics. I: Review of the literature;Afifi;J. Amer. Statist. Ass.,1966
2. Maximum likelihood estimates for a multivariate normal distribution when some observations are missing;Anderson;J. Amer. Statist. Ass.,1957
3. A method of estimation of missing values in multivariate data suitable for use with an electronic computer;Buck;J. R. Statist. Soc. B,1960
4. Dear , R. E. 1959 A principal-component missing-data method for multiple regression models
5. Multiple regression with missing observations among the independent variables;Edgett;J. Amer. Statist. Ass.,1956