@conference {gu2011valencia, title = {Comment on {\textquoteleft}Transparent parameterizations of models for potential outcomes,{\textquoteright} by Richardson, Evans, and Robins}, booktitle = {Bayesian Statistics 9: Proceedings of the Ninth Valencia International Meeting}, year = {2011}, publisher = {Oxford University Press}, organization = {Oxford University Press}, author = {Gustafson, P.}, editor = {Bernardo, J. M. and Bayarri, M. J. and Berger, J. O. and Dawid, A. P. and Heckerman, D. and Smith, A. F. M. and West, M.} }