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      Ref: (1)T.Yoshida and M.M.Sano: arXiv:cond-mat/0411611, 
              to appear in J.Phys.Soc.Jpn, Vol.72, No.2
           (2)Y.Yatsuyanagi,Y.Kiwamoto,H.Tomita,M.M.Sano,T.Yoshida, and T.Ebisuzaki: 
              accepted for publication in Phys.Rev.Lett.
           (3)M.M.Sano, Y.Yatsuyanagi, T.Yoshida and H.Tomita: 
              submitted for publication