Gravitational multi-NUT solitons, Komar masses and charges
  Generalising expressions given by Komar, we give precise definitions of gravitational mass and solitonic NUT charge and we apply these to the description of a class of Minkowski-signature multi-Taub-NUT solutions without rod singularities. A Wick rotation then yields the corresponding class of Euclidean-signature gravitational multi-instantons. 
Guillaume Bossard (AEI), Hermann Nicolai (AEI), K. S. Stelle (AEI,   Imperial Coll., London, CERN)