@article {LS11a, title = {Graphical models, potential outcomes and causal inference: Comment on Ramsey, Spirtes and Glymour}, journal = {NeuroImage}, volume = {57}, year = {2011}, pages = {334-336}, issn = {1053-8119}, doi = {10.1016/j.neuroimage.2010.10.020}, url = {http://www.sciencedirect.com/science/article/pii/S1053811910013121}, author = {Lindquist, Martin A and Sobel, M.E.} }