@article{Paff2009,
author = {Lolita Paff and Todd A. Watkins},
title = {What is the after-tax price of R&D? An interstate comparison},
journal = {Fiscal Studies},
year = {2009},
month = {Apr},
volume = {30},
number = {1},
pages = {73-101},
url = {http://onlinelibrary.wiley.com/doi/10.1111/j.1475-5890.2009.00090.x/abstract},
}