1. Extracules, intracules, correlation holes, potentials, coeficients and all that;Thakkar,1987
2. The Pair Density in Approximate Density Functionals: The Hidden Agent;Maitra,2000
3. Density matrices in the quantum theory of matter: Energy, intracules and extracules
4. Intracule and Extracule Densities: Historical Perspectives and Future prospects;Valderrama,2000
5. Two-electron distribution functions and intracules