Age at first drink relates to behavioral measures of impulsivity: The Immediate and Delayed Memory Tasks. 
Dougherty, D. M., Mathias, C. W., Tester, M. L., and Marsh, D. M.  (2004). 
Alcoholism: Clinical and Experimental Research, 28, 408-414.

Subtypes of aggression in Conduct Disorder: Differences in time estimation.
Mathias, C. W., Dougherty, D. M., Marsh, D. M., Frick, P. J., Pearson, D. A., and Tester, M. L.  (2004, March). 
Poster session presented at the 10th biennial meeting of the Society for Research on Adolescence, Baltimore, MD.

Behavioral impulsivity in Conduct Disorder: Adolescents with history of planned or unplanned aggression. 
Dougherty, D. M., Mathias, C. W., Marsh, D. M., Pearson, D. A. and Lee, M. (2003, June). 
Poster session presented at the 11th biennial meeting of the International Society for Research and Child and Adolescent Psychopathology, Sydney, Australia.

Age-at-first-drink among women and behavioral impulsivity. 
Mathias, C. W., Dougherty, D. M., Marsh, D. M., and Lee, M. A.  (2003, June). 
Poster session presented at the 65th annual meeting of the College of Problems on Drug Dependence, Bal Harbour, FL.

Update: Laboratory impulsive performance in adults with adolescent onset drinking. 
Mathias, C. W., Dougherty, D. M., Marsh, D. M., Moeller, F. G., and Lee, M. A.  (2003, February). 
Poster session presented at the 11th annual meeting of the Texas Research Society on Alcoholism, San Antonio, TX.