--- branches/development/src/nonbonded/MAW.cpp	2011/11/22 14:37:41	1664
+++ trunk/src/nonbonded/MAW.cpp	2013/06/16 15:15:42	1879
@@ -35,8 +35,9 @@
  *                                                                      
  * [1]  Meineke, et al., J. Comp. Chem. 26, 252-271 (2005).             
  * [2]  Fennell & Gezelter, J. Chem. Phys. 124, 234104 (2006).          
- * [3]  Sun, Lin & Gezelter, J. Chem. Phys. 128, 24107 (2008).          
- * [4]  Vardeman & Gezelter, in progress (2009).                        
+ * [3]  Sun, Lin & Gezelter, J. Chem. Phys. 128, 234107 (2008).          
+ * [4]  Kuang & Gezelter,  J. Chem. Phys. 133, 164101 (2010).
+ * [5]  Vardeman, Stocker & Gezelter, J. Chem. Theory Comput. 7, 834 (2011).
  */
 
 #include <stdio.h>
@@ -173,7 +174,7 @@ namespace OpenMD {
         myDerivC = 0.0;
       } else if (idat.shiftedForce) {
         myPotC = D_e * (expfnc2C - 2.0 * expfncC);
-        myDerivC  = 2.0 * D_e * beta * (expfnc2C - expfnc2C);
+        myDerivC  = 2.0 * D_e * beta * (expfncC - expfnc2C);
         myPotC += myDerivC * ( *(idat.rij)  -  *(idat.rcut) );
       } else {
         myPotC = 0.0;
@@ -184,7 +185,6 @@ namespace OpenMD {
       RealType y = r.y();
       RealType z = r.z();
       RealType x2 = x * x;
-      RealType y2 = y * y;
       RealType z2 = z * z;
 
       RealType r3 = *(idat.r2) *  *(idat.rij) ;