@article{Aalen2012,
author = {Aalen, O.O. and Røysland, K. and Gran, J.M.},
title= {Causality, mediation and time: A dynamic viewpoint},
year = {2012},
doi = {10.1111/j.1467-985X.2011.01030.x},
volume = {175},
number = {4},
pages = {831‒861},
}