1.
Izv Mikrobiol Inst (Sofiia)
; 20: 83-90, 1969.
Article
in Bulgarian
| MEDLINE
| ID: mdl-5398252
2.
Proc Natl Acad Sci U S A
; 56(5): 1417-22, 1966 Nov.
Article
in English
| MEDLINE
| ID: mdl-5230302