1. ESTIMATION AND INFERENCE IN NON-LINEAR STRUCTURAL MODELS;Berndt;Annals of Economic and Social Measurement,1974
2. MISSING DATA AND SELF-SELECTION IN LARGE PANELS;Griliches,1977
3. THE COMMON STRUCTURE OF STATISTICAL MODELS OF TRUNCATION, SAMPLE SELECTION, AND LIMITED DEPENDENT VARIABLES AND A SIMPLE ESTIMATOR FOR SUCH MODELS;Heckman;Annals of Economic and Social Measurement,1976
4. SHADOW PRICES, MARKET WAGES, AND LABOR SUPPLY;Heckman;Econometrica,1974
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