Stability of three-dimensional obliquely propagating dust acoustic waves in dusty plasma including the polarization force effect

 Propagation of dust acoustic solitary waves (DASWs) in a magnetized dusty 
plasma consisting of extremely massive, negatively/positively charged dust fluid and 
Boltzmann distributed electrons and ions is studied. A nonlinear Zakharov-Kuznetsov (ZK) 
equation adequate for describing the solitary waves is derived by applying a reductive 
perturbation technique. Moreover, an extended Zakharov Kuznetsov (EZK) equation is 
derived at the vicinity of the critical phase velocity. The effects of the polarization force are