@article{Jean-Pierre2008,
author = {Florens, Jean-Pierre and James Heckman and Costas Meghir and Edward Vytlacil},
title = {Instrumental variables, local instrumental variables and control functions},
journal = {Econometrica},
year = {2008},
month = {Sep},
volume = {76},
number = {5},
pages = {1191-1206},
url = {},
}