@article{SchmidtEsserIhleetal.1998,
  author    = {Schmidt, Martin H. and Esser, G{\"u}nter and Ihle, Wolfgang and Lay, Barbara},
  title     = {Psychosomatic and depressive symptoms at age eight and age eighteen},
  issn      = {0065-2008},
  year      = {1998},
  language  = {en}
}