@article{Todd2003,
author = {Todd, P.E. and Wolpin, K.I.},
title= {On the specification and estimation of the production function for cognitive achievement},
year = {2003},
doi = {10.1111/1468-0297.00097},
journal = {The Economic Journal},
volume = {113},
number = {485},
pages = {F3--F33},
}