Remark About Hamiltonian Formulation of Non-Linear Massive Gravity in   Stuckelberg Formalism
  We perform the Hamiltonian analysis of the specific model of the non-linear massive gravity in Stuckelberg formalism where the square root structure is replaced by introducing auxiliary fields. We show that the constraint structure of given theory varies over the phase space and discuss possible consequences of this fact for the counting of the physical degrees of freedom. 
J. Kluson
hep-th gr-qc