TY  - RPRT
TI  - A diagnostic approach to 'difficult' asthma.
AU  - M J Rumbak
AU  - T H Self
PY  - 1992
DO  - 10.1080/00325481.1992.11701441
UR  - https://pubmed.ncbi.nlm.nih.gov/1518763/
ID  - 1518763
ER  -