• [1]

    Y.Nambu and G.Jona-Lasinio,Phys Rev.,122(1961)345;124(1961)246.[2]S.Kreward and K.Nakayama,Ann.Phys.,216(1992)201.[3]D.Ebert and H.Reinhardt,Nucl.Phys,B271(1986)188.[4]T.Hatusda and T.Kunihiro,Phys.Rev.Lett.,55(1985)158.[5]V.Bernard,Phys.Rev.,D34(1986)1601.[6]V.Bernard,U.-G.Meissner and I.Zahed,Phys.Rev.Lett,59(1987)966.[7]P.Ferstl,M.Schaden and E.Werner,Nucl.Phys,A452(1986)680.[8]N.-W.Cao,C.M.Shakin and W.-D.Sun,Phys.Rev.,C46(1992)2535.[9]A.W.Blin,B.Hiller and M.Schaden,Z.Phys,A336(1988)75.[10]S.Klimt,M.Lutz,U.Vogl and W.Weise,Nucl.Phys.,A516(1990)429;469.