Jimenez-Murcia S, Granero R, Larrea ST, Sauvaget A, Grall-Bronnec M, Alvarez-Moya EM, Aguera Z, Aymami N, Gomez-Pena M, Del Pino-Gutierrez A, Moragas L, Menchon JM, Fagundo AB, Sauchelli S, La Verde M, Aguglia E, Signorelli MS, Formoso JAF, Fernandez-Aranda F. Pathological gambling and substance use disorders: effects of early incidence and personality. Drugs Health Society. 2015 Jan;14(1):78. doi: 10.7202/1035550ar
Britt (DiBenedetti) DM, Collins FL, Cohen LM. Cigarette smoking and chewing gum use among college students. J Appl Biobehav Res. 2007 Jun 4;4(2):85-90. doi: 10.1111/j.1751-9861.1999.tb00057.x