1. Istituto di Chimica Biomolecolare, Consiglio Nazionale delle Ricerche, Piazzale Aldo Moro 5, 00185 Rome, Italy, Fax: (internat.) + 39‐06/49913628
2. Hunter College, Department of Chemistry, 695 Park Avenue, New York, NY 10021, USA, Fax: (internat.) + 1‐212/772‐5332
3. The Graduate School, City University of New York, 365 Fifth Avenue, New York, NY 10016, USA, Fax: (internat.) + 1‐212/772‐5332
4. Università di Camerino, Dipartimento di Scienze Chimiche, Via S. Agostino, 1, Camerino (MC), Italy, Fax: (internat.) + 39‐0737/637345
5. Universidad de Santiago, Facultad de Quimica y Biologia, Santiago 33, Chile, Fax: (internat.) + 56‐2/6812108
6. Vassar College, Department of Chemistry, Poughkeepsie, NY 12604‐0484, USA, Fax: (internat.) + 1‐845/437‐5732