TY  - RPRT
TI  - Electrocardiography: standards, techniques, and training.
AU  - D M Krikler
PY  - 1971
DO  - 10.1016/s0140-6736(71)91349-3
UR  - https://pubmed.ncbi.nlm.nih.gov/4104991/
ID  - 4104991
ER  -