ArbaniR P (1971) Interregional Seminar on Surveillance and Assessment in Smallpox Eradication. Unpublished World Health Organization document WHO/SE/71.30; p 126
2.
AritaIGispenRKalterS SWahL TMarennikovaS SNetterRTagayaI (1972) Bulletin of the World Health Organization46, 625
3.
AritaIHendersonD A (1968) Bulletin of the World Health Organization39, 277
4.
CollierL H (1955) Journal of Hygiene53, 76
5.
CrookshankE M (1889) History and Pathology of Vaccination. H K Lewis, London; 2, 276
6.
de QuadrosC AWeithalerK LSiemonJ (1973) International journal of Epidemiology (in press)
7.
GispenRBrand-SaathofB (1972) Bulletin of the World Health Organization46, 585
8.
LadnyjI DZieglerPKimaE (1972) Bulletin of the World Health Organization46, 593
9.
LeakeJ P (1943) Medical Clinics of North America27, 603
10.
von MagnusPAndersenE KPetersenK BBirsch-AndersenA (1959) Acta pathologica et microbiologie Scandinavica46, 156
11.
MarennikovaS SŠeluhinaE MMal'cevaN NCimiskjanK LMacevičG R (1972) Bulletin of the World Health Organization46, 599
12.
MarennikovaS SŠeluhinaE MMal'cevaN NLadnyjI D (1972) Bulletin of the World Health Organization46, 613
13.
NobleJRichJ A (1969) Bulletin of the World Health Organization40, 279
14.
World Health Organization (1948) Epidemiological and Vital Statistics Reports13, 262
15.
World Health Organization (1972) World Health, October
16.
World Health Organization (1973) Weekly Epidemiological Record48, 9
