• [1]

    K. G. Wilson, Phys. Rev.,D6(1972), 419.[2] P. M. Stevenson, Phys, Rev., D30(1984), 1712; 31(1985), 1386.[3] P. M. Stevenson and R. Tarrach, Phys. Lett., 176B(1986), 436; P. M. Stevenson, B. Alles and R. Tarrach, Phys. Rev., D'35(1987), 2407; P. M. Stevenson, Z. Phys., C35(1987), 467;S-y Lou and G-j Ni, Phys. Rev., D37(1988), 3770;G. A. Hajj and P. M. Stevenson, Phys., D37(1988), 413.[4] G-j Ni, S-y Lou and S-q Chen, Int. J. Mod. Phys.; A3(1988), 1735; Phys. Lett, 200B(1988),161;[5] A.Okopinska, Phys. Rcv., D35(1987),1835; D36(1987), 2417;U.Kaulfuss and M. Altembokum, Phys.Rev., D35(1987), 609;I.Yotsuanagi, Z.Phys., C35(1987), 453.[6] J. I. Latorre and J. Soto, Phys. Rcv., D34(1986), 3111.[7] A. Okopinska, IFT/43/87 (1987 Preprint)[8] S-y Lou and G-j Ni, Commun. Theor. Phys., 12(1989), 83.[9] Y. Nambu and G. Jona-Lasino, Phys. Rev., 122(1961), 345.[10] D. J. Gross and A. Neveu, Phys: Rev., D10(1974), 3235.[11] T. Barnes and G. I. Ghandour, Nucl, Phys., B146(1978), 483; Phys. Rev., D22(1980), 924.[12] P. M. Stevenson and G. A. Hajj, Phys. Rev., D34(1986), 3117.[13] L. Jacobs, Phyt. Rea., DIO(1974), 3956; B. J. Harrington and A. Yildiz, Phys. Rev., D11(1975), 779[14] G-j Ni, Nucl. Phys., B211 (1983), 414[15] L. Dolan and R. Jackiw, Phys. Rev.,D9(1974), 3320[16] I. Roditi, Phys. Lett., 169B(1986), 264.[17] A. Vilenkin, Nucl. Phys., B226(1983), 527.