1.
Geneva; 1971. (WHO/SE/71.33).
| WHO IRIS
| ID: who-67491
2.
Geneva; 1971. (WHO/SE/71.29).
| WHO IRIS
| ID: who-67487
3.
Geneva; 1971. (WHO/SE/71.26).
| WHO IRIS
| ID: who-67484
4.
Geneva; 1969. (WHO/SE/69.13).
| WHO IRIS
| ID: who-67468