1. ALAEZ L., LEON L.M., Anales Real Soc.Esp. de Quim., in press.
2. BAWN C.E.H., FITZSIMMONS C., LEDWITH A., Proc.Chem.Soc., 391 (1964).
3. BONNER T.G., CLAYTON J.M., WILLIAMS G., J.Chem.Soc., 1705 (1958)
4. BOWYER P.M., LEDWITH A., SHERRINGTON D.C., J.Chem.Soc.,B, 1511 (1971a).
5. BOWYER P.M., LEDWITH A., SHERRINGTON D.C., Polymer, 12, 509(1971b).