1.
San José; Banco Mundial; 2000. 22 p. tab.
Monography
in Spanish
| LILACS
| ID: lil-380851
2.
Biomédica (Bogotá)
; Biomédica (Bogotá);19(4): 331-4, dic. 1999. graf
Article
in Spanish
| LILACS
| ID: lil-252662