I was looking through the following presentation: http://folk.uio.no/helgaker/talks/SostrupIntegrals_10.pdf
Looking at the section on 4-electron integrals, I couldn't help but notice that the slides wrote that the 4-electron terms (Kij and Jij) were Gabcd x Dcd. [see slide 25]
I realised that Dcd was referring to the dipole-moment integral. Maybe I just missed something here, but what does the dipole moment integral have got to do with the 4-electron integrals?
This is particularly confusing for me since I notice that the guide here (which uses the same notation afaik) uses Dij^2 as the auxiliary kinetic-energy integral.