 <B>46</B>, 5453 (1992); 
47, 165 (1993))
Three variants of these methods are included in NWChem:

<UL>
<LI><TT>sic perturbative</TT> This is the default option for the sic
directive. After a self-consistent calculation, the Kohn-Sham
orbitals are localized with the Foster-Boys algorithm (see section
<A HREF="node12.html#orbloc">10.15</A>) and the self-interaction energy is added to the total energy. 
All exchange-correlation functionals implemented in the NWChem can be
used with this option.
</LI>
<LI><TT>