1.
Cesk Epidemiol Mikrobiol Imunol
; 19(5): 272-7, 1970 Sep.
Article
in Czech
| MEDLINE
| ID: mdl-4248389
2.
J Hyg Epidemiol Microbiol Immunol
; 12(3): 296-305, 1968.
Article
in English
| MEDLINE
| ID: mdl-4977454