TY  - RPRT
TI  - Attention-deficit/hyperactivity disorder and comorbidity.
AU  - T Spencer
AU  - J Biederman
AU  - T Wilens
PY  - 1999
DO  - 10.1016/s0031-3955(05)70163-2
UR  - https://pubmed.ncbi.nlm.nih.gov/10570696/
ID  - 10570696
ER  -