1.
Foro Mundial de la Salud (OMS)
; 12(4): 467-468, 1991.
Article
in Spanish
| PAHO
| ID: pah-12048
2.
Article
in French
| WHO IRIS
| ID: who-50572
3.
Article
in English
| WHO IRIS
| ID: who-45924
4.
Article
in Spanish
| WHO IRIS
| ID: who-52080