TY  - RPRT
TI  - [Sentinel practice data quality. Denominator concepts, spatial and temporal frequency patterns. Special issue following the "1st Sentinel-Workshop Hannover" on 29 April 1992].
PY  - 1993
UR  - https://pubmed.ncbi.nlm.nih.gov/8467120/
ID  - 8467120
ER  -