Bandwidth selection for kernel estimators of the spatial intensity   function
  We discuss and compare various approaches to the problem of bandwidth selection for kernel estimators of intensity functions of spatial point processes. We also propose a new method based on the Campbell formula applied to the reciprocal intensity function. The new method is fully non-parametric, does not require knowledge of the product densities, and is not restricted to a specific class of point process models. 
O. Cronie, M.N.M. van Lieshout
stat.ME