Electron correlation: The many-body problem at the heart of chemistry. - David P. Tew; Wim Klopper; Trygve Helgaker (J. Comput. Chem., 2007)

The MP2-F12 method in the TURBOMOLE program package. - Rafal A. Bachorz; Florian A. Bischoff; Andreas Glöß; Christof Hättig; Sebastian Höfener; Wim Klopper; David P. Tew (J. Comput. Chem., 2011)