1. Agip Nucleare SpA, Viale Brenta 29, Milano, itaiy
2. Ente Nazionale Energie Alternative, Viale Regina Martherita 125, Roma, Italy
3. Commission of the European Communities, Joint Research Centre, Karlsruhe Establishment, European Institute for Transuranium Elements, Postfach 2266, D-7500 Karlsruhe, FRG