Kristyan, Sandor. “Evaluation of Coulomb Integrals With Various Energy Operators to Estimate the Correlation Energy in Electronic Structure Calculations for Molecules”. European Journal of Chemistry 14, no. 4 (December 31, 2023): 486–493. Accessed November 21, 2024. https://eurjchem.com/index.php/eurjchem/article/view/2480.