Spherical dust acoustic solitary waves with two temperature ions
  The nonlinear dust acoustic waves in unmagnetized dusty plasma which consists of two temperature Boltzmann distributed ions and Boltzmann distributed electrons in spherical dimension investigated and obtained spherical Kadomtsev Petviashvili (SKP) equation and shown that the dust acoustic solitary wave can exist in the SKP equation. 
Esmaeil Eslami and Rasoul Baraz
physics.plasm-ph