TY  - RPRT
TI  - The Markellis Card: an immunization system.
AU  - V C Markellis
PY  - 1973
DO  - 10.1111/j.1746-1561.1973.tb03714.x
UR  - https://pubmed.ncbi.nlm.nih.gov/4488077/
ID  - 4488077
ER  -