1. Resolution WHA 44-25 Rec Int Leg San, 1991; 42(3).
2. Austria. Rec Int Leg San, 1986; 37 (1): 34–35.
3. Belgium. Rec Int Leg San, 1987; 38 (3): 562–569.
4. Belgium. Rec Int Leg San, 1990; 41 (1): 38–40.
5. Denmark. Rec Int Leg San, 1991; 42 (1): 32–33.