Extension of Grimus-Stockinger formula from operator expansion of free   Green function
  The operator expansion of free Green function of Helmholtz equation for arbitrary N- dimension space leads to asymptotic extension of 3- dimension Grimus-Stockinger formula closely related to multipole expansion. Analytical examples inspired by neutrino oscillation and neutrino deficit problems are considered for relevant class of wave packets 
S.E. Korenblit, D.V. Taychenachev
math-ph hep-th math.MP