1. Aleksandrov D V, Belyatskii A F, Glukhov Yu A, Nikolskii E Yu, Ogloblin A A and Stepanov D N 1984JETP Lett. 40 909
2. Barwick S W, Price P B and Stevenson J D 1985Phys. Rev. C31 1984
3. Lecture Notes in Physics;R R Betts,1981
4. Betts R R 1984Proc. Fifth adriatic Int. Conf. on Nucl. Phys. Hvar (Yugoslavia) (eds) N Cindroet al (Singapore: World Scientific) p. 33
5. Blendowske R, Fliessback T and Walliser H 1987Nucl. Phys. A464 75