A remarkable spectral feature of the Schrödinger Hamiltonian of the harmonic oscillator perturbed by an attractive δ'-interaction centred at the origin: double degeneracy and … S Albeverio, S Fassari, F Rinaldi J. Phys. A: Math. Theor. 46 (38 (5305)), 2013 | 58 | 2013 |

On the spectrum of the harmonic oscillator with a delta-type perturbation. S Fassari, G Inglese Helv. Phys. Acta 67 (6), 650-659, 1994 | 44 | 1994 |

On the spectrum of the Schrödinger Hamiltonian of the one-dimensional harmonic oscillator perturbed by two identical attractive point interactions S Fassari, F Rinaldi Reports on Mathematical Physics 69 (3), 353-370, 2012 | 43 | 2012 |

The Hamiltonian of the harmonic oscillator with an attractive δ′-interaction centred at the origin as approximated by the one with a triple of attractive δ-interactions S Albeverio, S Fassari, F Rinaldi Journal of Physics A: Mathematical and Theoretical 49 (2), 025302, 2015 | 38 | 2015 |

Spectroscopy of a one-dimensional V-shaped quantum well with a point impurity S Fassari, M Gadella, ML Glasser, LM Nieto Annals of Physics 389, 48-62, 2018 | 36 | 2018 |

On the spectrum of the Schrödinger Hamiltonian with a particular configuration of three one-dimensional point interactions S Fassari, F Rinaldi Reports on Mathematical Physics 64 (3), 367-393, 2009 | 32 | 2009 |

The discrete spectrum of the spinless one-dimensional Salpeter Hamiltonian perturbed by δ-interactions S Albeverio, S Fassari, F Rinaldi Journal of Physics A: Mathematical and Theoretical 48 (18), 185301, 2015 | 30 | 2015 |

On the spectrum of the harmonic oscillator with a delta-type perturbation. II S Fassari, G Inglese Helv. Phys. Acta 70 (6), 858-865, 1997 | 28 | 1997 |

Spectroscopy of a Three-Dimensional Isotropic Harmonic Oscillator with a Delta-Type Perturbation S Fassari, G Inglese Helvetica Physica Acta 69 (2), 130-140, 1996 | 28 | 1996 |

Spectral properties.....II S Albeverio, S Fassari, F Rinaldi Nanosystems: Physics, Chemistry, Mathematics 7 (5), 803-815, 2016 | 23* | 2016 |

Spectral properties of a symmetric three-dimensional quantum dot with a pair of identical attractive δ-impurities symmetrically situated around the origin S Albeverio, S Fassari, F Rinaldi Наносистемы: физика, химия, математика 7 (2), 268-289, 2016 | 23 | 2016 |

Coupling constant thresholds of perturbed periodic Hamiltonians S Fassari, M Klaus Journal of Mathematical Physics 39 (9), 4369-4416, 1998 | 19 | 1998 |

The Birman-Schwinger operator for a parabolic quantum well in a zero-thickness layer in the presence of an attractive Gaussian impurity S Fassari, S Albeverio, F Rinaldi, M Gadella, LM Nieto Frontiers in Physics 7, 102, 2019 | 13* | 2019 |

An Estimate Regarding One-Dimensional Point Interactions S Fassari Helvetica Physica Acta 68 (2), 121-125, 1995 | 13 | 1995 |

Level crossings of eigenvalues of the Schrödinger Hamiltonian of the isotropic harmonic oscillator perturbed by a central point interaction in different dimensions S Fassari, M Gadella, ML Glasser, LM Nieto, F Rinaldi Наносистемы: физика, химия, математика 9 (2), 179-186, 2018 | 12 | 2018 |

Spectral properties of the two-dimensional Schrödinger Hamiltonian with various solvable confinements in the presence of a central point perturbation S Fassari, M Gadella, ML Glasser, LM Nieto, F Rinaldi Physica Scripta 94 (5), 055202, 2019 | 11 | 2019 |

On the spectrum of the one-dimensional Schrödinger Hamiltonian perturbed by an attractive Gaussian potential S Fassari, M Gadella Urquiza, LM Nieto Calzada, F Rinaldi | 11 | 2017 |

On some potential applications of the heat equation with a repulsive point interaction to derivative pricing S FASSARI, F RINALDI Rendiconti di Matematica, Serie VII 31, 35-52, 2011 | 11 | 2011 |

A note on the eigenvalues of the Hamiltonian of the harmonic oscillator perturbed by the potential λx2 (1+ gx2) S Fassari Reports on Mathematical Physics 37 (2), 283-293, 1996 | 9 | 1996 |

A note on the discrete spectrum of Gaussian wells (I): the ground state energy in one dimension G Muchatibaya, S Fassari, F Rinaldi, J Mushanyu Advances in Mathematical Physics, 2016 | 8 | 2016 |