Enlace original:
https://apps.who.int/iris/handle/10665/68233
Foster, Stanley O
,
Abdulgadir, H. E. S
,
Kamaluddin, H. A
,
World Health Organization
,
[Smallpox transmission in an isolated nomadic group / by S.O. Foster, H.E.S. Abdulgadir and H.A. Kamaluddin]