A comment on the derivation of the atomic kinetic energy functionals with full Weizsäcker correction

In a recent paper [J. Chem. Phys. 76, 1467 (1982)], Gázquez and Robles derive a kinetic energy functional of the type T[ρ]=TW[ρ]+[1−(2/N)][1−(C0/N1/3) +(C1/N2/3)−⋅⋅⋅]TTF[ρ] (TW and TTF are the Weizsäcker and the Thomas–Fermi functionals) by considering the sine waves of free particles in a cube. We get different C0 and C1 values from those of Gázquez and Robles by considering periodic complex exponential waves instead of the sine waves.