TY  - RPRT
TI  - Fourth sound gallop or split first sound?
AU  - D H Spodick
PY  - 1973
DO  - 10.1016/0002-9149(73)90314-7
UR  - https://pubmed.ncbi.nlm.nih.gov/4692591/
ID  - 4692591
ER  -