Strichartz Estimates in Spherical Coordinates
  In this paper we study Strichartz estimates for dispersive equations which are defined by radially symmetric pseudo-differential operators, and of which initial data belongs to spaces of Sobolev type defined in spherical coordinates. We obtain the space time estimates on the best possible range including the endpoint cases. 
Yonggeun Cho and Sanghyuk Lee
math.AP math.CA