1.
Boletín de la Oficina Sanitaria Panamericana (OSP)
; 61(4): 339-49, oct. 1966. Tab
Article
in Spanish
| PAHO
| ID: pah-36209
2.
Bulletin of the World Health Organization (WHO)
; 33(3): 405-12, 1965.
Article
in English
| PAHO
| ID: pah-37999
3.
4.
Boletín de la Oficina Sanitaria Panamericana (OSP)
; 61(4),oct. 1966 Tab
Article
| PAHO-IRIS
| ID: phr-12784