function RCCD{T}(ref::Fermi.HartreeFock.RHF.RHFWavefunction,alg::Fermi.CoupledCluster.DPD,int::Fermi.CoupledCluster.Conventional) where T <: AbstractFloat
    error("RCCD with cc_alg $alg and ints_type $int is not implemented. Sorry!")
end
          
