1. Private communication with the Cyclotron Corporation, U.S.A.
2. B. Laisson, Paper F.12 at this Conference.
3. M. Kligerman, Paper F.13 at this Conference.
4. M. A. Chaudhri, to be published.
5. J. Lange and H. Muenzel, Report KFK-767 (1968), Gesellschaft fuer Kernforschung m. b. H. Karlsruhe.