From: braa.s.khayat@gmail.com   
      
   Does anyone have a reference for the Hessian matrix in spherical coordinates?   
   I have only come across the appendix in https://arxiv.org/pdf/0705.3747.pdf   
   I would like to find another for confirmation.   
   Introductory calculus refer to the Hessian as a double application of the   
   differentiation matrix, but that result would be different than the one in the   
   reference above. Hence I would like to find an explicitly written Hessian.   
      
   Much gracias   
      
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