TY  - RPRT
TI  - Letter: Pneumococcal antigen in sputum.
AU  - J Verhoef
AU  - D M Jones
PY  - 1974
DO  - 10.1016/s0140-6736(74)90544-3
UR  - https://pubmed.ncbi.nlm.nih.gov/4132846/
ID  - 4132846
ER  -