TY  - RPRT
TI  - Methodological problems of psychiatry.
AU  - R Gebhardt
AU  - H Helmchen
AU  - H Hippius
PY  - 1967
DO  - 10.1016/s0010-440x(67)80065-8
UR  - https://pubmed.ncbi.nlm.nih.gov/6063143/
ID  - 6063143
ER  -