________________________________________________________________________________________________
Interelectronic moments of atomic systems.
J.S. Dehesa, J.C. Angulo, T. Koga and Y. Kasai.
Physical Review A 48 (1993) 832-835.
T. Koga, Y. Kasai, J.S. Dehesa and J.C. Angulo.
Physical Review A 48 (1993) 2457-2460.
Bounds to some local electron-pair properties with application to two-electron ions.
J.S. Dehesa, J.C. Angulo, T. Koga and Y. Kasai.
Physical Review A 50 (1994) 857-860.