http://www.ase.tufts.edu/gdae/Pubs/wp/16-01Capaldo-IzurietaTPP.pdf
http://www.piie.com/publications/wp/wp16-5.pdf?utm_source=GDAE+Subscribers&utm_campaign=56a3ab5c36-TPP_TCB_3_21_2016&utm_medium=email&utm_term=0_72d4918ff9-56a3ab5c36-52174293
