TY - JOUR TI - Identification and Inference in Nonlinear Difference-in-Differences Models AU - Susan Carleton Athey AU - Guido W. Imbens JO - Econometrica PY - 2006 VL - 74 IS - 2 DO - 10.1111/j.1468-0262.2006.00668.x UR - https://doi.org/10.1111/j.1468-0262.2006.00668.x ER -