Molecular electronic-structure theory T Helgaker, P Jorgensen, J Olsen John Wiley & Sons, 2014 | 3198 | 2014 |

Basis-set convergence of correlated calculations on water T Helgaker, W Klopper, H Koch, J Noga The Journal of chemical physics 106 (23), 9639-9646, 1997 | 2028 | 1997 |

Basis-set convergence in correlated calculations on Ne, N2, and H2O A Halkier, T Helgaker, P Jørgensen, W Klopper, H Koch, J Olsen, ... Chemical Physics Letters 286 (3-4), 243-252, 1998 | 1908 | 1998 |

Ab initio methods for the calculation of NMR shielding and indirect spin− spin coupling constants T Helgaker, M Jaszuński, K Ruud Chemical Reviews 99 (1), 293-352, 1999 | 1430 | 1999 |

Excitation energies in density functional theory: An evaluation and a diagnostic test MJG Peach, P Benfield, T Helgaker, DJ Tozer The Journal of chemical physics 128 (4), 044118, 2008 | 1119 | 2008 |

The D alton quantum chemistry program system K Aidas, C Angeli, KL Bak, V Bakken, R Bast, L Boman, O Christiansen, ... Wiley Interdisciplinary Reviews: Computational Molecular Science 4 (3), 269-284, 2014 | 827 | 2014 |

Basis-set convergence of the energy in molecular Hartree–Fock calculations A Halkier, T Helgaker, P Jørgensen, W Klopper, J Olsen Chemical Physics Letters 302 (5-6), 437-446, 1999 | 581 | 1999 |

Excitation energies from the coupled cluster singles and doubles linear response function (CCSDLR). Applications to Be, CH^{+}, CO, and H_{2}OH Koch, HJA Jensen, P Jo/rgensen, T Helgaker The Journal of chemical physics 93 (5), 3345-3350, 1990 | 520 | 1990 |

Assessment of a Coulomb-attenuated exchange–correlation energy functional MJG Peach, T Helgaker, P Sałek, TW Keal, OB Lutnæs, DJ Tozer, ... Physical Chemistry Chemical Physics 8 (5), 558-562, 2006 | 462 | 2006 |

Recent advances in wave function-based methods of molecular-property calculations T Helgaker, S Coriani, P Jørgensen, K Kristensen, J Olsen, K Ruud Chemical reviews 112 (1), 543-631, 2012 | 440 | 2012 |

Basis set convergence of the interaction energy of hydrogen-bonded complexes A Halkier, W Klopper, T Helgaker, P Jo/rgensen, PR Taylor The Journal of chemical physics 111 (20), 9157-9167, 1999 | 375 | 1999 |

The CC3 model: An iterative coupled cluster approach including connected triples H Koch, O Christiansen, P Jo/rgensen, AM Sanchez de Merás, T Helgaker The Journal of chemical physics 106 (5), 1808-1818, 1997 | 375 | 1997 |

Analytical calculation of nuclear magnetic resonance indirect spin–spin coupling constants at the generalized gradient approximation and hybrid levels of density-functional theory T Helgaker, M Watson, NC Handy The Journal of Chemical Physics 113 (21), 9402-9409, 2000 | 372 | 2000 |

The prediction of molecular equilibrium structures by the standard electronic wave functions T Helgaker, J Gauss, P Jo/rgensen, J Olsen The Journal of chemical physics 106 (15), 6430-6440, 1997 | 360 | 1997 |

Density-functional theory of linear and nonlinear time-dependent molecular properties P Sałek, O Vahtras, T Helgaker, H Ågren The Journal of chemical physics 117 (21), 9630-9645, 2002 | 358 | 2002 |

The accurate determination of molecular equilibrium structures KL Bak, J Gauss, P Jørgensen, J Olsen, T Helgaker, JF Stanton The Journal of Chemical Physics 114 (15), 6548-6556, 2001 | 350 | 2001 |

An electronic Hamiltonian for origin independent calculations of magnetic properties T Helgaker, P Jo/rgensen The Journal of chemical physics 95 (4), 2595-2601, 1991 | 335 | 1991 |

DALTON, a molecular electronic structure program T Helgaker, HJA Jensen, P Jørgensen, J Olsen, K Ruud, H Ågren, ... Release 1, 63, 2001 | 288 | 2001 |

Integration of the classical equations of motion on ab initio molecular potential energy surfaces using gradients and Hessians: application to translational energy release upon … T Helgaker, E Uggerud, HJA Jensen Chemical physics letters 173 (2-3), 145-150, 1990 | 274 | 1990 |

Vibrational Raman optical activity calculations using London atomic orbitals T Helgaker, K Ruud, KL Bak, P Jørgensen, J Olsen Faraday Discussions 99, 165-180, 1994 | 254 | 1994 |