Lieb, R., Schuster, P., Pfister, H., Wunderlich, U., Holly, A., Mastaler, M., Sonntag, H., Gander, F., Höfler, M., Lachner, G., Perkonigg, A., Garczynski, E., Türk, D., & Wittchen, H.-U. (1998). Vulnerability and protective factors in early developmental stages of substance use disorders. European Addiction Research, 4, 206-207.