1.
Berlin; Springer-Verlag; 1996.
in English
| WHO IRIS
| ID: who-37457
2.
Berlin; Springer-Verlag; 1994.
in English
| WHO IRIS
| ID: who-41833
3.
Berlin; Springer-Verlag; 1991.
| WHO IRIS
| ID: who-41044
4.
Berlin; Springer-Verlag; 1991.
| WHO IRIS
| ID: who-36878
5.
Berlin; Springer-Verlag; 1990.
| WHO IRIS
| ID: who-37013