Jc. Shaw et Mh. Tu, THE CONSTRAINED MODIFIED KP HIERARCHY AND THE GENERALIZED MIURA-TRANSFORMATIONS, Journal of physics. A, mathematical and general, 30(21), 1997, pp. 725-731
In this letter, we consider the second Hamiltonian structure of the co
nstrained modified KP hierarchy. After mapping the Lax operator to a p
ure differential operator the second structure becomes the sum of the
second and the third Gelfand-Dickey brackets defined by this different
ial operator. We simplify this Hamiltonian structure by factorizing th
e Lax operator into linear terms.