1.
World Health Organization monograph series ; no. 20
Monography
in English, French
| WHO IRIS
| ID: who-41130
2.
Organisation mondiale de la Santé. Série de monographies ; no. 20
Monography
in English, French
| WHO IRIS
| ID: who-38804
3.
4.
Bull. W.H.O. (Print)
; 8(5-6): 633-645, 1953.
Article
in English
| WHO IRIS
| ID: who-266291