Number of items: 2.
Florens, Jean-Pierre, Heckman, James J., Meghir, Costas and Vytlacil, Edward (2008) Identification of Treatment Effects Using Control Functions in Model with Continuous Endogenous Treatment and Heterogenous Effects. Econometrica, 76 (5). pp. 1191-1206.
Florens, Jean-Pierre, Heckman, James J., Meghir, Costas and Vytlacil, Edward (2003) Instrumental Variables, Local Instrumental Variables and Control Functions. IDEI Working Paper, n. 249