TY  - JOUR
A1  - Esser, Günter
A1  - Laucht, Manfred
A1  - Schmidt, Martin H.
T1  - The Significance of Biological and Psychosocial Risks for Behaviour Problems of Children at Preschool age
Y1  - 1996
ER  - 
TY  - JOUR
A1  - Esser, Günter
A1  - Schmidt, Martin H.
T1  - Prevalence, course and risk factors for mental disorders
Y1  - 1996
ER  -