S. Fournais, M. Hoffmann-Ostenhof, T. Hoffmann-Ostenhof and T. \O stergaard S\o rensen
Analyticity of the density of electronic wavefunctions
(188K, Postscript)

ABSTRACT.  We prove that the electronic densities of 
atomic and molecular eigenfunctions are real analytic in ${\mathbb R}^3$ 
away from the nuclei.