e, J.&nbsp;Chem.&nbsp;Phys.&nbsp;<B>98</B>, 5648 (1993). 
<BR></LI>
<LI>A.D.Becke, J. Chem. Phys. <B>107</B>, 8554 (1997). 
<BR></LI>
<LI>H.L.Schmider and A.D.&nbsp;Becke, J.&nbsp;Chem.&nbsp;Phys.&nbsp;<B>108</B>,
9624 (1998). 
<BR></LI>
<LI>C.Adamo and V.Barone, J.&nbsp;Chem.&nbsp;Phys. <B>110</B>, 6158 (1998).
<BR></LI>
<LI>A.J.Cohen and N.C. Handy, Chem. Phys. Lett. <B>316</B>, 160 (2000).
<BR></LI>
<LI>A.D.Boese,  N.C.Handy, J. Chem. Phys. <B>114</B>, 5497
(2001). 
<BR></LI>
<LI>N.C.Handy, A.J. Cohen, M