1.
Salud pública Méx
; 31(2): 196-205, mar.-abr. 1989. tab
Article
in Spanish
| LILACS
| ID: lil-68186
2.
Salud pública Méx
; 31(1): 3-17, ene.-feb. 1989. ilus, tab
Article
in Spanish
| LILACS
| ID: lil-68240