Mazur, G., Makowski, M., Sumera, J., & Kowalczyk, K. (2012). Efficient Energy and Electrostatic Properties Calculations at the MP2 Theory Level: A Case Study of Density Matrix-Based Computational Quantum Chemistry. Computing and Informatics, 31(3), 665–673. https://cai.type.sk/content/2012/3/efficient-energy-and-electrostatic-properties-calculations-at-the-mp2-theory-level-a-case-study-of-density-matrix-based-computational-quantum-chemistry/