1.
Salud Publica Mex
; 24(3): 321-7, 1982.
Article
in Spanish
| MEDLINE
| ID: mdl-6815813
2.
Salud pública Méx
; 24(3): 321-337, 1982.
Article
in Spanish
| LILACS
| ID: lil-9989
3.
Rev Invest Salud Publica
; 27(4): 327-32, 1967.
Article
in Spanish
| MEDLINE
| ID: mdl-4980225