TY  - RPRT
TI  - Luftsichel sign upperlobe collapse.
AU  - David Isbell
AU  - Daniel Grinnan
AU  - Manesh R Patel
PY  - 2002
DO  - 10.1016/s0002-9343(02)01076-8
UR  - https://pubmed.ncbi.nlm.nih.gov/12034421/
ID  - 12034421
ER  -