Gravitational energy-momentum in small regions according to the   tetrad-teleparallel expressions
  The gravitational energy-momentum within a small region as determined by two tetrad-teleparallel expressions is evaluated with the aid of an orthonormal frame adapted to Riemann normal coordinates. We find that the gauge current "tensor" does enjoy the highly desired and rare property of being a positive multiple of the Bel-Robinson tensor, whereas M{\o}ller's expression does not. 
Lau Loi So and James M. Nester