1. Vögtle, F.: Chimia33, 239 (1979); Vögtle, F., Weber, E.: Angew. Chem.91, 813 (1979)
2. Weeks, C.M., Rohrer, D.C., Duax, W.L.: Science190, 1096 (1975); Kuhn, H.: Ber. Bunsenges. Phys. Chem.80, 1209 (1976)
3. Vögtle, F., Müller, W.M., Weber, E.: Chem. Ber. (in press)
4. Vögtle, F., Müller, W.M.: ibid, (in press)
5. Braun, W., Dönhardt, A. (Hrsg.): Vergiftungsregister, p. 145. Stuttgart: Thieme 1975; cf. also Weast, R.C. (ed.): CRC Handbook of Laboratory Safety. Cleveland, Ohio: CRC Press 1971