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Ravens-Sieberer, Ulrike, Otto, Christiane, Kriston, Levente 
ORCID: 0000-0003-0748-264X, Rothenberger, Aribert, Doepfner, Manfred, Herpertz-Dahlmann, Beate, Barkmann, Claus, Schoen, Gerhard, Hoelling, Heike, Schulte-Markwort, Michael and Klasen, Fionna
(2015).
The longitudinal BELLA study: design, methods and first results on the course of mental health problems.
Eur. Child Adolesc. Psych., 24 (6).
S. 651 - 664.
NEW YORK:
SPRINGER.
ISSN 1435-165X