Sparse maps—A systematic infrastructure for reduced-scaling electronic structure methods. I. An efficient and simple linear scaling local MP2 method that uses an intermediate basis of pair natural orbitals
Peter Pinski, Christoph Riplinger, Edward F. Valeev, Frank Neese (2015). Sparse maps—A systematic infrastructure for reduced-scaling electronic structure methods. I. An efficient and simple linear scaling local MP2 method that uses an intermediate basis of pair natural orbitals. The Journal of Chemical Physics, 143(3), DOI: 10.1063/1.4926879.
