1.
Bol Oficina Sanit Panam
; 103(5): 472-7, 1987 Nov.
Article
in Spanish
| MEDLINE
| ID: mdl-2964246
2.
Salud Publica Mex
; 29(3): 190-4, 1987.
Article
in Spanish
| MEDLINE
| ID: mdl-3116678
3.
Salud Publica Mex
; 29(3): 195-200, 1987.
Article
in Spanish
| MEDLINE
| ID: mdl-3116679