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A note on the two-level pairing model obeying the su(2) circle times su(2)- algebra - Re-formation on terms of the su(1,1) circle times su(1,1)- algebra

Authors: C. PROVIDÊNCIA, J. DA PROVIDÊNCIA, Y. TSUE and M. YAMAMURA

Ref.: Prog. Theor. Phys. 115, 759-764 (2006)