Nonstandard expansion techniques for the effective potential in λ φ 4 quantum field theory A Okopińska Physical Review D 35 (6), 1835, 1987 | 293 | 1987 |

Nonstandard expansion techniques for the finite-temperature effective potential in λ quantum field theory A Okopińska Physical Review D 36 (8), 2415, 1987 | 72 | 1987 |

Optimized expansion in quantum field theory of massive fermions with (ψ¯ ψ) 2 interaction A Okopińska Physical Review D 38 (8), 2507, 1988 | 51 | 1988 |

Non-standard perturbative methods for the effective potential in λφ^{4} QFTA Okopinska International Centre for Theoretical Physics, 1986 | 39 | 1986 |

Accurate energy levels and partition function of a quantum-mechanical anharmonic oscillator A Okopińska Physical Review D 36 (4), 1273, 1987 | 38 | 1987 |

Two-electron entanglement in elliptically deformed quantum dots P Kościk, A Okopińska Physics Letters A 374 (37), 3841-3846, 2010 | 35 | 2010 |

Goldstone bosons in the Gaussian approximation A Okopińska Physics Letters B 375 (1-4), 213-216, 1996 | 31 | 1996 |

Correlation effects in the Moshinsky model P Kościk, A Okopińska Few-Body Systems 54 (7-10), 1637-1640, 2013 | 30 | 2013 |

Entanglement entropies in the ground states of helium-like atoms P Kościk, A Okopińska Few-Body Systems 55, 1151-1157, 2014 | 28 | 2014 |

Optimized expansion for the effective action and multi-particle states in the scalar quantum field theory A Okopinska Annals of Physics 228 (1), 19-42, 1993 | 23 | 1993 |

A simple alternative to the relativistic Breit–Wigner distribution F Giacosa, A Okopińska, V Shastry The European Physical Journal A 57 (12), 336, 2021 | 21 | 2021 |

The optimized Rayleigh–Ritz scheme for determining the quantum-mechanical spectrum P Kościk, A Okopińska Journal of Physics A: Mathematical and Theoretical 40 (35), 10851, 2007 | 17 | 2007 |

Fokker-Planck equation for bistable potential in the optimized expansion A Okopińska Physical Review E 65 (6), 062101, 2002 | 14 | 2002 |

Entanglement properties of the two-electron quasi-one dimensional Gaussian quantum dot A Kuroś, A Okopińska Few-Body Systems 56, 853-858, 2015 | 13 | 2015 |

Exact finite reduced density matrix and von Neumann entropy for the Calogero model O Osenda, FM Pont, A Okopińska, P Serra Journal of Physics A: Mathematical and Theoretical 48 (48), 485301, 2015 | 13 | 2015 |

Quasi-exact solutions for two interacting electrons in two-dimensional anisotropic dots P Kościk, A Okopińska Journal of Physics A: Mathematical and Theoretical 40 (5), 1045, 2007 | 12 | 2007 |

Application of the Fröbenius method to the Schrödinger equation for a spherically symmetric potential: an anharmonic oscillator P Kościk, A Okopińska Journal of Physics A: Mathematical and General 38 (35), 7743, 2005 | 12 | 2005 |

Correlation and entanglement measures in trapped few-particle systems A Okopińska Journal of Physics: Conference Series 213 (1), 012004, 2010 | 10 | 2010 |

Optimized perturbation method for the propagation in the anharmonic oscillator potential A Okopińska Physics Letters A 249 (4), 259-264, 1998 | 10 | 1998 |

Determination of resonances by the optimized spectral approach A Kuroś, P Kościk, A Okopińska Journal of Physics A: Mathematical and Theoretical 46 (8), 085303, 2013 | 9 | 2013 |