TY  - RPRT
TI  - Spirometric reference values in Estonian schoolchildren.
AU  - J Kivastik
AU  - P H Kingisepp
PY  - 2001
DO  - 10.1046/j.1365-2281.2001.00352.x
UR  - https://pubmed.ncbi.nlm.nih.gov/11442581/
ID  - 11442581
ER  -