1. Jain, P.L., Sengupta, K., Singh, G.: Phys. Rev. C44, 844 (1991)
2. Jain, P.L., Singh, G., Sengupta, K., Kim, S.N.: Int. J. Mod. Phys. A7, 1907 (1992)
3. Singh, G., Sengupta, K., Jain, P.L.: Phys. Rev. C41, 999 (1990)
4. Jain, P.L., Singh, G.: Z. Phys. C ? Particles and Fields53, 355 (1992)
5. Jain, P.L., Singh, G., Sengupta, K.: Phys. Rev. C43, R2027 (1991)