1.
Bol. cir. (La Paz)
;
3(2): 5-6, jun. 1994.
Article
in Spanish
| LILACS
| ID: lil-174544
2.
Bol. cir. (La Paz)
;
2(3): 6-7, sept. 1993.
Article
in Spanish
| LILACS
| ID: lil-174534