A Note on the Two-Level Pairing Model Obeying the su(2)*su(2)-Algebra
  The two-level pairing model obeying the su(2)*su(2)-algebra, which was discussed in the previous paper, is re-formed in the framework of the su(1,1)*su(1,1)-algebra in the Schwinger boson representation. With the aid of MYT mapping method, the Schwinger boson representation is reduced to the Holstein-Primakoff boson representation, which is expressed in terms of two kinds of bosons. Further, with the aid of the squeezed coherent state, the classical counterpart is obtained. 
C.Providencia (Univ. de Coimbra, Portugal), J.da Providencia (Univ. de   Coimbra, Portugal), Y.Tsue (Kochi Univ., Japan) and...