Glueball-glueball potential in a constituent gluon model
  In this work we use a mapping technique to derive in the context of a constituent gluon model an effective Hamiltonian that involves explicit gluon degrees of freedom. We study glueballs with two gluons using the Fock-Tani formalism. In the present work we calculate the glueball-glueball potential, in the context of the constituent gluon model, with gluon interchange. 
M. L. L. da Silva, D. Hadjimichef and C. A. Z. Vasconcellos
hep-ph nucl-th