@article{SchmidHohmBlomeyeretal.2007,
  author    = {Brigitte Schmid and Erika Hohm and Dorothea Blomeyer and Ulrich S. Zimmermann and Martin H. Schmidt and G{\"u}nter Esser and Manfred Laucht},
  title     = {Concurrent alcohol and tobacco use during early adolescence characterizes a group at risk},
  doi       = {10.1093/alcalc/agm024},
  url       = {http://alcalc.oxfordjournals.org/},
  year      = {2007},
}