Optimse evaluation of <ij||ab> in k-space.
Optimse evaluation of <ij||ab> in k-space.

Make use of symmetries to reduce the number of non-zero integrals.

hande-qmc/hande,hande-qmc/hande,hande-qmc/hande,ruthfranklin/hande,hande-qmc/hande,hande-qmc/hande