-
[1]
G.'t Hooft,Phys.Rev.Lett,37(1976)8.[2]A.A.Belarin,A.M.Polyakov,A.S.Schwartz.and Yu.S.Tyupkin,Phys.Lett.,B59(1975)85.[3]N.S.Manton,Phys.Rev,D28(1983)2019;F.R.Klinkhamer and N.S.Manton Phys.Rev.,D30(1984)2212.[4]V.A.Kuzmin,V.A.Rubakov and M.E.Shaposhnikov,Phys.Lett.,B155(1985)36.[5]A.I.Bochkarev and M.E.shaposhnikov,Mod.Phys.Lett,A2(1987)991.[6]D.Yu.Grigoriev,V.A.Rubakov and M.E.Shaposhnikov,Phys.Lett,B216(1989)172;Nucl.Phys.B326(1989)737.[7]Y.Brihaye,S.Giller,D.Kosinski and J.Kunz,CERN-TH,6598/92.[8]N.S.Manton and T.M.Samols,Phys.Lett,B207(1989)179.[9]Jiu-QinyLiany,H.J.W.Miller-kirsten and D.H.Tchrakian,Phys.Lett,B282(1992)105.[10]R.Rajaraman,Solitons and instantons(North-Holland,Amsterdam,1982).[11]E.T.Whittaker and G.N.Watson.Acourse of Modern Analysis(Cambridge UP.,Cambridge,4-thEdition1927).