1.
Bol. Oficina Sanit. Panam
;
98(4): 343-350, abr. 1985.
Article
in Spanish
| LILACS
| ID: lil-375708
2.
Washington, D.C; s.n; 1985. 193 p. (PNSP/85-28).
Non-conventional
in English
| LILACS
| ID: lil-375933
3.
Bol. Oficina Sanit. Panam
;
95(5): 466-469, 1983.
Article
in Spanish
| LILACS
| ID: lil-373701