@article{Koopmans1997,
author = {Koopmans, J.R. and van Doornen, L.J.P. and Boomsma, D.I.},
title= {Association between alcohol use and smoking in adolescent and young adult twins: A bivariate genetic analysis},
year = {1997},
doi = {10.1111/j.1530-0277.1997.tb03800.x},
journal = {Alcoholism: Clinical and Experimental Research},
volume = {21},
number = {3},
pages = {537--546},
}