TY  - RPRT
TI  - [Several reasons for a decrease in vaccinal immunity against diphtheria in school children].
AU  - M A Zhogova
AU  - K S Grigorovich
AU  - S V Bogoradova
PY  - 1966
UR  - https://pubmed.ncbi.nlm.nih.gov/6004851/
ID  - 6004851
ER  -