On the Weyl-Wigner-Moyal Description of SU$(\infty)$ Nahm Equations
  We show how the reduced Self-dual Yang-Mills theory described by the Nahm equations can be carried over to the Weyl-Wigner-Moyal formalism employed recently in Self-dual gravity. Evidence of the existence of correspondence between BPS magnetic monopoles and space-time hyper-K\"ahler metrics is given. 
Hugo Garcia-Compean, Jerzy F. Plebanski (CINVESTAV-IPN)