1.
Article
in Spanish
| WHO IRIS
| ID: who-49280
2.
Article
in French
| WHO IRIS
| ID: who-53662
3.
Article
in English
| WHO IRIS
| ID: who-52584
4.
World Health Forum (WHO)
; 15(3): 236-7, 1994.
Article
in English
| PAHO
| ID: pah-18694
5.
Foro Mundial de la Salud (OMS)
; 15(3): 258-60, 1994.
Article
in Spanish
| PAHO
| ID: pah-20321