• [1]

    E. Witten, Nucl. Phys, B160 (1979), 57,[2] T . H. E. Skyrme, Proc. Roy. Soc, A260(1961). 127.[3] D. Finkelstein and J . Rubinstein, J. Mazh. Phys, 9(1968), 1762.[4] E. Witten, Nucl. Phys., B223(1983), 422.[5] E. Witten, Nucl. Phys, B223(1983), 433.[6] E. Guadagnini, Nucl. Phys., B236(1984), 35.[7] G. Adkins, C Nappi and E. Witten, Nucl. Phys., B228(1983), 552.[8] G. Adkins and C. Nappi, Phys. Lett,, 137B(1984), 251.[9] G. Adkins and C. Nappi, Nucl. Phys, B233(1984), 109.[10] P. 0. Mazur, M. A. Nowak and M. Praszalowicz, Phys. Lett., 147B(1984), 137.[11] K. Fujii, S. Otsuki and F. Toyoda, KYUSHU-84-HE-j(1984).[12] I;. Fujii, S. Otsuki and F. Toyoda, Prog. Thcor. Phys., 73(1985), 524, 1287.[13] Iiuang Tao, Wen Jiaru, Zhou Xianjian, Chinese Phys. Lezz., V. 3, N. 2(1986), 85.[14] J . Goldstone and F. Wilczk, Phys. Rev. Lett, 47(1981), 986.[15] E. B. Bogomol'nyi and V . A. Fateev, Sou. J. Nucl. Phys., 37(1983), 134.[16] A. Jackson, A. D. Jackson and V. Pasquier, Nucl. Phys., A. 432(1984), 567.[17] H. Weigal, B. Schwesinger and G. Holzwarth, Phys. Lett., 168B(1986), 321.[18] R. Vinh Mau. M. Lacombe, B. Loiseau, W. N. Cottingham and P. Lisboa Phys. Lett, 150B(1985), 259.[19] U. G. Meissner and U. B. Kaulfuss, Phys. Rev., C30(1984), 2058.[20] E. Sorce and M. Tarlini, Phys. Rcu., D33(1986), 153.[21] H. M. Sommermann, H. W . Wyld, and C. J . Perhick, Phys. Rev. Lett., 55(1985), 476.