TY  - RPRT
TI  - A SIMPLE SCALED RULER FOR USE IN SPIROMETRY.
AU  - P LOCKWOOD
PY  - 1963
DO  - 10.1016/s0007-0971(63)80056-x
UR  - https://pubmed.ncbi.nlm.nih.gov/14069566/
ID  - 14069566
ER  -