Applicability of coupled‐pair theories to quasidegenerate electronic states: A model study K Jankowski, J Paldus International Journal of Quantum Chemistry 18 (5), 1243-1269, 1980 | 328 | 1980 |

A coupled‐cluster method for quasidegenerate states L Meissner, K Jankowski, J Wasilewski International journal of quantum chemistry 34 (6), 535-557, 1988 | 184 | 1988 |

Davidson‐type corrections for quasidegenerate states K Jankowski, L Meissner, J Wasilewski International journal of quantum chemistry 28 (6), 931-942, 1985 | 140 | 1985 |

The impact of higher polarization basis functions on molecular *ab initio* results. I. The ground state of F_{2}K Jankowski, R Becherer, P Scharf, H Schiffer, R Ahlrichs The Journal of chemical physics 82 (3), 1413-1419, 1985 | 136 | 1985 |

Applicability of valence‐universal multireference coupled‐cluster theories to quasidegenerate electronic states. I. Models involving at most two‐body amplitudes K Jankowski, J Paldus, I Grabowski, K Kowalski The Journal of chemical physics 97 (10), 7600-7612, 1992 | 105* | 1992 |

The impact of higher polarization basis functions on molecular AB initio results II. The ground states of CO, N2, O2, and F2 R Ahlrichs, P Scharf, K Jankowski Chemical physics 98 (3), 381-386, 1985 | 96 | 1985 |

Application of symmetry-adapted pair functions in atomic structure calculations: A variational-perturbation treatment of the Ne atom K Jankowski, P Malinowski Physical Review A 21 (1), 45, 1980 | 95 | 1980 |

Towards complete solutions to systems of nonlinear equations of many-electron theories K Kowalski, K Jankowski Physical Review Letters 81 (6), 1195, 1998 | 80 | 1998 |

Symmetry-adapted coupled-pair approach to the many-electron correlation problem. II. Application to the Be atom BG Adams, K Jankowski, J Paldus Physical Review A 24 (5), 2316, 1981 | 74 | 1981 |

Symmetry-adapted coupled-pair approach to the many-electron correlation problem. III. Approximate coupled-pair approaches for the Be atom BG Adams, K Jankowski, J Paldus Physical Review A 24 (5), 2330, 1981 | 67 | 1981 |

Benchmark energy calculations on Be-like atoms J Komasa, J Rychlewski, K Jankowski Physical Review A 65 (4), 042507, 2002 | 66 | 2002 |

Method of moments approach and coupled cluster theory K Jankowski, J Paldus, P Piecuch Theoretica chimica acta 80 (4), 223-243, 1991 | 65 | 1991 |

Cluster relations for multireference coupled‐cluster theories: A model study K Jankowski, J Paldus, J Wasilewski The Journal of chemical physics 95 (5), 3549-3561, 1991 | 64 | 1991 |

Applicability of nondegenerate many‐body perturbation theory to quasi‐degenerate electronic states. II. A two‐state model S Wilson, K Jankowski, J Paldus International journal of quantum chemistry 28 (4), 525-534, 1985 | 59 | 1985 |

Second-order correlation energies for F 1−, Na 1+, Mg 2+, and Ar 8+: Z dependence of irreducible-pair energies K Jankowski, P Malinowski, M Polasik Physical Review A 22 (1), 51, 1980 | 50 | 1980 |

Electron-correlation third-order contributions to the electric dipole transition amplitudes of rare earth ions in crystals: I. Perturbed-function approach K Jankowski, L Smentek-Mielczarek, A Sokołowski Molecular Physics 59 (6), 1165-1175, 1986 | 48 | 1986 |

Applicability of valence‐universal multireference coupled‐cluster theories to quasidegenerate electronic states. II. Models involving three‐body amplitudes K Jankowski, J Paldus, I Grabowski, K Kowalski The Journal of chemical physics 101 (4), 3085-3095, 1994 | 46 | 1994 |

Quasi-degeneracy and coupled-pair theories BG Adams, K Jankowski, J Paldus Chemical Physics Letters 67 (1), 144-148, 1979 | 45 | 1979 |

Second-order correlation energies of Mg and Ar K Jankowski, P Malinowski, M Polasik Journal of Physics B: Atomic and Molecular Physics 12 (19), 3157, 1979 | 45 | 1979 |

Second‐order electron correlation energies for Zn^{2+} and ZnK Jankowski, P Malinowski, M Polasik The Journal of Chemical Physics 76 (1), 448-457, 1982 | 40 | 1982 |