A detailed analysis of dipolar interactions and analytical   approximations in arrays of magnetic nanowires
  The investigation of the role of interactions in magnetic wire arrays is complex and often subject to strong simplifications. In this paper we obtained analytical expressions for the magnetostatic interactions between wires and investigate the range of validity of dipole-dipole, first order and second order approximations. We also analyze the extension of the interwire magnetostatic interactions in a sample and found that the number of wires required to reach energy convergence in the array strongly depends on the relative magnetic orientation between the wires. 
D. Laroze, J. Escrig, P. Landeros, D. Altbir, M. V\'azquez and P.   Vargas