1.
Acta Microbiol Bulg
; 21: 76-81, 1987.
Article
in Bulgarian
| MEDLINE
| ID: mdl-3439495
2.
Acta Microbiol Virol Immunol (Sofiia)
; 4: 105-12, 1976.
Article
in Bulgarian
| MEDLINE
| ID: mdl-1087528