upward

Numeric atomic orbitals

V Blum, R Gehrke, F Hanke, P Havu, V Havu, X Ren, K Reuter, M Scheffler, Ab initio molecular simulations with numeric atom-centered orbitals, CPC 180, 2175 (2009)

Bachau H, Cormier E, Decleva P, Hansen J E, Martin F, Applications of B-splines in atomic and molecular physics, RPP 64, 1815 (2001)