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Ravens-Sieberer U, Wille N, Erhart M, Bettge S, Wittchen HU, Rothenberger A, Herpertz-Dahlmann B, Resch F, Hölling H, Bullinger M, Barkmann C, Schulte-Markwort M, Döpfner M; BELLA study group.Ravens-Sieberer U, et al. Among authors: erhart m.Eur Child Adolesc Psychiatry. 2008 Dec;17 Suppl 1:22-33. doi: 10.1007/s00787-008-1003-2.Eur Child Adolesc Psychiatry. 2008.PMID: 19132301
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Berra S, Ravens-Sieberer U, Erhart M, Tebé C, Bisegger C, Duer W, von Rueden U, Herdman M, Alonso J, Rajmil L; European KIDSCREEN group [kidscreen].Berra S, et al. Among authors: erhart m.BMC Public Health. 2007 Jul 26;7:182. doi: 10.1186/1471-2458-7-182.BMC Public Health. 2007.PMID: 17655756Free PMC article.