TY  - RPRT
TI  - Letter: Second degree A-V block.
AU  - N el-Sherif
AU  - B J Scherlag
AU  - R Lazzara
PY  - 1974
DO  - 10.1016/0002-9149(74)90721-8
UR  - https://pubmed.ncbi.nlm.nih.gov/4432823/
ID  - 4432823
ER  -