1.
Tr Leningr Nauchnoissled Inst Epidemiol Mikrobiol
; 42: 113-9, 1973.
Article
in Russian
| MEDLINE
| ID: mdl-4808372
2.
Tr Leningr Nauchnoissled Inst Epidemiol Mikrobiol
; 42: 120-4, 1973.
Article
in Russian
| MEDLINE
| ID: mdl-4808374