1. Ninth Int. Conf. on Cyclotrons and their Applications;Acerbi,1981
2. L. Calabretta and E. Migneco, these proceedings (6th Tandem Conf.), p. 158.
3. Int. Conf. on Performance of Data Communication Systems and their Applications;Anzalone,1981
4. LXVIII Congresso Nazionale della Societá Italiana di Fisica;Anzalone;Boll. S.I.F.,1982