1. G. Buescher and D. Düwel, 11th Conference of the World Association for the Advancement of Veterinary Parasitology, Rio de Janeiro, August 5–9, 1985, Abstract No. 70
2. J. Eckert, 11th Conference of the World Association for the Advancement of Veterinary Parasitology, Rio de Janeiro, August 5–9, 1985, Abstract No. 71
3. B. Tiefenbach, 11th Conference of the World Association for the Advancement of Veterinary Parasitology, Rio de Janeiro, August 5–9, 1985, Abstract No. 72
4. F.A.M. Echevarria, 11th Conference of the World Association for the Advancement of Veterinary Parasitology, Rio de Janeiro, August 5–9, 1985, Abstract No. 73
5. D. Düwel, 11th Conference of the World Association for the Advancement of Veterinary Parasitology, Rio de Janeiro, August 5–9, 1986, Abstract No. 201