"Toward a clearer definition of confounding" revisited with directed acyclic graphs
American Journal of Epidemiology (2012) - Comments
pubmed: 22904203  doi: 10.1093/aje/kws127  issn: 1476-6256  issn: 0002-9262 

Penelope P Howards, Enrique F Schisterman, Charles Poole, Jay S Kaufman, Clarice R Weinberg