• [1]

    B.I.Halprin,Phys.Rev.Lett,52(1984)1583.[2]R.B.Laughlin,Phys.Rev.Lett,60(1988)2677.[3]C.Semen off,Phys.Rev.Lett,61(1988)517.[4]C.Hagen,Phys.Rev.Lett,63(1988)1025;G.Semen off,Phys.RevLett,63(1988)1026;C.R.Hagen,Phys.Rev,D44(1991)2614.[5]R.Jackiw and S.Y.Pi,Phys Rev,D42(1990)3500;S.Forte,Rev.Mod.Phys,64(1992)193.[6]E.Fradkin,Phys.Rev.Lett 63(1989)1322;E.Fradkin,Phys.Rev,B42(1990)570.[7]D.Eliezer.and G.W.Semenoff,Ann.Phys,217(1992)66.[8]M.Lscker,Nucl.Phys,B326(1989)557.[9]R.Kantor and L.Suss kind,Int J.Mod.Phys,B5(1991)2701.[10]K.Banerjee,Phys.Rev.Lett,69(1992)17.[11]P.M.A.Dirac,Lectures on Quantum Mechanics(Yeskiva Univ.NY,1964).