TY  - RPRT
TI  - Tracheobronchial cast.
AU  - K P Ravikrishnan
AU  - J W Dircks
PY  - 1977
DO  - 10.1378/chest.71.2.241
UR  - https://pubmed.ncbi.nlm.nih.gov/832506/
ID  - 832506
ER  -