TY  - RPRT
TI  - Protective layer covering pathogenic treponemata.
AU  - S CHRISTIANSEN
PY  - 1963
DO  - 10.1016/s0140-6736(63)92309-2
UR  - https://pubmed.ncbi.nlm.nih.gov/14021145/
ID  - 14021145
ER  -