Simple recipe for implementing computation of first-order relativistic corrections to electron correlation energies in framework of direct perturbation theory. - Wim Klopper (J. Comput. Chem., 1997)

Equilibrium inversion barrier of NH3 from extrapolated coupled-cluster pair energies. - Wim Klopper; Claire C. M. Samson; György Tarczay; Attila G. Császár (J. Comput. Chem., 2001)

Basis-set completeness profiles in two dimensions. - Alexander A. Auer; Trygve Helgaker; Wim Klopper (J. Comput. Chem., 2002)

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)

Acceleration of self-consistent-field convergence by combining conventional diagonalization and a diagonalization-free procedure. - Alexander Baldes; Wim Klopper; Ján Simunek; Jozef Noga; Florian Weigend (J. Comput. Chem., 2011)

Implementation of the Bethe-Salpeter equation in the TURBOMOLE program. - Katharina Krause; Wim Klopper (J. Comput. Chem., 2017)