Calculation of Coordinates From Molecular Geometric Parameters and the Concept of a Geometric Calculator. - Hanno Essén; Mats Svensson (Comput. Chem., 1996)

On the evaluation of electrostatic energy of volume charge distributions and the role of the Coulomb singularity. - Johan C. E. Sten; Hanno Essén (Math. Comput. Simul., 2023)