J. Dukelsky et Gg. Dussel, Application of the density matrix renormalization group to the two level pairing model, PHYS REV C, 59(6), 1999, pp. R3005-R3008
We introduce the density matrix renormalization group as an efficient trunc
ation scheme which can be applied to nuclear shell model problems. To illus
trate the power of the method we perform a calculation for the two level pa
iring model showing its convergence properties.