Comment about the use of Monte-Carlo methodology for the representation   of atomic electronic densities
  Representations of atomic orbitals based on Monte-Carlo (MC) approaches are not always correct when using various sets of orthogonal coordinates other than Cartesian coordinates. The analysis proposed here gives elements for a proper use of MC methodology. It can be very useful for students and for teachers. 
Jean Hoarau and Jean-Claude Rayez
physics.chem-ph