Non-factorizable Contribution to $B_K$ of Order $\langle G^3 \rangle$
  Within the Chiral Quark Model we have calculated the effect of non-factorizable $\langle G^3 \rangle$ contribution to the $B_K$ parameter. When all diagrams are summed, a vanishing result is obtained. 
A. E. Bergan (University of Oslo, Norway)